merge(master): resolve conflicts for PR #906 providers/insights

Merge prgs/master into feat/issue-650-providers-insights. Conflicts in
webui/app.py, webui/nav.py, and docs/webui-local-dev.md kept both:
- #650 providers/insights routes and docs
- #645 gitea linkage routes and docs

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

docs/mcp-restart-audit.md

@@ -1,93 +0,0 @@
-# MCP restart audit events and incidents (#665)
-
-Restarts and recovery attempts leave a forensic trail. Failed drains and
-break-glass paths also raise durable Gitea incident issues so unsafe restarts
-cannot be silently repeated.
-
-Parent umbrella: **#655**. Related: impact coordinator **#658**, drain proof
-**#661**, restart classes **#663**, break-glass **#664**, post-restart reconcile
-**#662**, vision **#652**, roadmap **#653**, console recovery **#642**.
-
-## Components
-
-| Piece | Where | Responsibility |
-|-------|-------|----------------|
-| Event schema + emission | `restart_audit.py` | `mcp.restart.*` vocabulary, redacted payload builder, append-only sink via `gitea_audit` |
-| Fail-closed privileged gate | `restart_audit.require_audit_or_deny` | When `GITEA_AUDIT_LOG` is set and the write fails, privileged apply is denied |
-| Incident descriptors | `restart_audit.build_incident_descriptor` | Durable follow-up issues (failed drain, break-glass, reconcile unresolved, unguarded) |
-| Materializer | `restart_audit.materialize_incident` | Injected `create_issue_fn` (network kept out of pure tests) |
-| Wiring | `gitea_request_mcp_restart` | Correlation id, impact-preview audit, apply-gate / break-glass audit + incident creation |
-
-## Event vocabulary
-
-| Event type | When |
-|------------|------|
-| `mcp.restart.impact_preview` | Every `gitea_request_mcp_restart` evaluation |
-| `mcp.restart.drain_enter` | Drain window starts (schema reserved; emit from drain path) |
-| `mcp.restart.drain_exit` | Drain window ends |
-| `mcp.restart.drain_proof` | Drain-proof verification result |
-| `mcp.restart.apply_gate` | Apply hard gate (`dry_run=False`) |
-| `mcp.restart.break_glass` | Authorized break-glass bypass |
-| `mcp.restart.post_restart_reconcile` | Post-restart reconcile outcome |
-| `mcp.restart.narrower_recovery` | Narrower recovery attempt recorded |
-| `mcp.restart.unguarded_detected` | Unguarded restart path detected |
-
-All free text is redacted before sink write or issue body assembly. Emission
-never raises; callers decide fail-closed policy.
-
-## Correlation
-
-Each restart lifecycle mints a short `correlation_id` (`rst-` + 16 hex) shared
-across impact preview → apply gate → incident descriptors so operators can join
-the trail.
-
-## Privileged deny-on-audit-fail
-
-Rollout policy (issue #665):
-
-1. Configure `GITEA_AUDIT_LOG` so writes land.
-2. Only then enforce deny when a privileged restart path cannot audit.
-
-When audit is **not** configured, privileged apply still proceeds (no false
-denials during rollout). When audit **is** configured and the write fails,
-`apply_authorized` is cleared.
-
-## Incidents
-
-| Kind | Trigger |
-|------|---------|
-| `restart_failed_drain` | Apply denied by drain hard gate / failed proof |
-| `restart_break_glass` | Any authorized break-glass apply |
-| `restart_reconcile_unresolved` | Post-restart reconcile left work unresolved |
-| `restart_unguarded_detected` | Unguarded restart attempt detected |
-
-Break-glass **always** creates an incident descriptor (and a Gitea issue when
-the create path is available). Failed drain does the same. Incident bodies
-include correlation id, session, class, scope, proof id, and redacted reasons.
-
-Default labels: `mcp-health`, `safety`, `observability`, `status:ready`,
-`type:bug`, `workflow-hardening`.
-
-## Tool payload surface
-
-`gitea_request_mcp_restart` returns:
-
-* `correlation_id` — lifecycle join key
-* `restart_audit.impact_preview_written` — sink success for the preview event
-* `restart_audit.apply_gate_written` — sink success for apply/break-glass (apply only)
-* `restart_audit.incident_result` — materialization outcome when an incident was required
-* `incident` — durable descriptor (when gate requires follow-up)
-
-## Security
-
-* No secrets in audit payloads or issue bodies.
-* This module never restarts a process.
-* Drain proof verification remains #661; audit only records the decision.
-* Incident creation failures are recorded in `incident_result.reasons` and never
-  crash the restart evaluation path (audit write failure still fails closed for
-  privileged apply when the sink is enabled).
-
-## Tests
-
-See `tests/test_restart_audit.py`: schema, redaction, emission, deny policy,
-incident materialization mocks, break-glass / failed-drain selection.

docs/mcp-restart-coordinator.md

@@ -33,7 +33,6 @@ recovery behavior for all nine classes.
 | `ControlPlaneDB.list_sessions` | `control_plane_db.py` | Read-only session inventory (the process-level unit a restart kills). |
 | `gitea_request_mcp_restart` | `gitea_mcp_server.py` | MCP tool: gathers inventory from the #613 DB, calls the coordinator, returns the report, and on `dry_run=False` runs the #661 drain-proof hard gate. Never restarts a process. |
 | `drain_proof.gate_apply_restart` | `drain_proof.py` | The #661 hard gate: verifies a drain proof against the current impact fingerprint, or records an authorized break-glass bypass. |
-| `restart_audit` | `restart_audit.py` | #665 forensic trail: `mcp.restart.*` events via `gitea_audit`, correlation ids, durable incidents for failed drain / break-glass. See [`mcp-restart-audit.md`](./mcp-restart-audit.md). |
 
 ## Dimensions evaluated
 

docs/webui-local-dev.md

@@ -80,10 +80,15 @@ status, onboarding checklist state, and the fail-closed error payloads (#635).
 | `/sessions` | Runtime and session view (#641) — health + inventory sessions/namespaces/worktrees |
 | `/api/sessions` | JSON export for the runtime/session view |
 | `/api/v1/sessions` | Versioned alias of `/api/sessions` |
+| `/gitea` | Gitea issue↔PR linkage console (#645) — both directions, with the evidence for each edge |
+| `/api/v1/gitea/linkage` | JSON linkage export; `502` when the read could not be answered |
 | `/inventory` | Phase 1 shell stub — unified inventory (backed by #636) |
 | `/timeline` | Phase 1 shell stub — workflow event timeline |
 | `/policy` | Phase 1 shell stub — capability/role policy placeholder |
-| `/insights` | Phase 1 shell stub — operational insights placeholder |
+| `/providers` | AI-provider connection status (#650) — declared registry only, no secrets |
+| `/api/v1/providers` | JSON provider connections; `502` when the registry cannot be loaded |
+| `/insights` | Evidence-backed operational insights (#650) — advisory only |
+| `/api/v1/insights` | JSON insights export with evidence refs and source availability |
 
 Most routes are GET-only. POST/PUT/PATCH/DELETE return `405` with
 `read-only-mvp`, except `/audit` and `/api/audit` which accept POST for
@@ -327,6 +332,118 @@ Honesty rules specific to this view:
   The write-time redactor is a narrow denylist and is not relied on. The field
   itself is kept — it is the `#630` evidence naming which daemon was killed.
 
+## AI providers and operational insights (#650)
+
+`/providers` and `/insights` are the Phase 4 **advisory** surfaces for AI-provider
+connections and evidence-backed operational findings. They never expose API keys,
+never mutate Gitea, and never authorize review, merge, or close.
+
+### Provider connections (`/providers`)
+
+Status is taken from the **worker registry** declaration (`webui/data/workers.registry.json`
+or `WEBUI_WORKER_REGISTRY`):
+
+| Field | Meaning |
+|-------|---------|
+| `connection_status` | `declared_available` or `declared_unavailable` from the registry `available` flag |
+| `models` | Declared model list only (not a live vendor enumeration) |
+| `worker_count` / `enabled_worker_count` | How many worker instances name this provider |
+| `secrets_exposed` | Always `false` — credentials are never loaded |
+
+Live executable health is **not** probed here (that belongs to the provider adapter
+framework). The page states this probe limit explicitly so a green badge is not
+misread as a process heartbeat.
+
+`GET /api/v1/providers` returns the same model (`schema_version: 1`). It answers
+`502` when the registry cannot be loaded so consumers cannot treat a fail-closed
+payload as “no providers configured”.
+
+### Operational insights (`/insights`)
+
+Insights are pure functions over durable console evidence:
+
+| Kind | Evidence source |
+|------|-----------------|
+| `blocked_queue_pressure` | Traffic control blocked bucket (issue/PR numbers + reasons) |
+| `controller_attention` | Traffic control `needs_controller` items |
+| `stale_runtime_risk` | System-health stale_runtime / mutation_safe |
+| `provider_without_workers` | Declared-available providers with zero workers |
+| `analytics_failure_pressure` | Analytics events with failure status (when loaded) |
+
+Rules:
+
+* Every insight carries at least one evidence ref (`kind` + `ref` + `detail`).
+  Evidence-less insights are refused, not emitted.
+* `advisory_only` is always true; `claims_action_completed` is always false.
+* Missing sources appear under `sources_unavailable` — never as a silent empty
+  “all clear”.
+* Titles and details pass through console redaction before display.
+
+`GET /api/v1/insights` exports the same model. The HTML page always renders
+interpretation limits so operators know these cards do not override workflow gates.
+
+## Gitea issue/PR linkage (#645)
+
+`/gitea` is the Phase 3 read-only linkage console: which PR carries which issue,
+which issues are claimed by more than one PR, and what the latest Canonical
+Thread Handoff on a thread said. Gitea remains the source of truth — this
+surface reads it and never writes to it. There is no issue/PR editor, no review,
+and no merge control.
+
+Query parameters (all optional):
+
+| Parameter | Meaning |
+|-----------|---------|
+| `project` | Registry project id to scope the read (default: first registry entry) |
+| `state` | `open` (default) or `all`; `all` widens the window to merged/closed items, where a landed edge lives |
+| `issue=N` / `pr=N` | Focus one thread and load *its* latest canonical handoff |
+
+`GET /api/v1/gitea/linkage` returns the same model as JSON
+(`schema_version: 1`). It answers `502` when the read could not be answered, so
+an automated consumer cannot mistake a fail-closed payload for "no links exist".
+The HTML page always answers `200` and renders the reason instead — an operator
+view must show why a read failed rather than withhold the page.
+
+### How an edge is found
+
+Each edge carries the evidence that produced it, strongest first:
+
+| Evidence | Meaning |
+|----------|---------|
+| `closes_keyword` | The PR title or body declares `closes/fixes/resolves #N`. Gitea itself acts on this keyword. |
+| `branch_marker` | The PR head branch carries the canonical `(fix\|feat\|docs\|chore)/issue-N-…` marker minted by the issue lock. |
+| `body_reference` | The PR body mentions `#N` with no closing keyword. A mention is not a claim to close. |
+
+Only closing and branch-marker edges populate the **issue → PR** direction: a
+bare mention is a cross-link, and counting it as ownership would invent
+contested issues out of ordinary references. The mention stays visible on the
+**PR → issue** side, labelled as such. A PR whose two strongest edges tie is
+flagged `ambiguous`; an issue claimed by two PRs is flagged `contested`.
+
+### Honesty rules specific to this view
+
+* **A partial read never reads as an absence.** Linkage is a claim about the
+  loaded window only. When pagination did not complete, every empty edge cell
+  renders `none found (partial inventory)` rather than `none`, and the JSON
+  carries `inventory_complete: false` plus per-row `links_authoritative: false`.
+* **A failed read renders no table at all.** Missing credentials, an unknown
+  project, or a fetch error produce `ok: false` with a reason. An empty linkage
+  table would assert that no issue is linked to any PR, which such a read is not
+  in a position to claim.
+* **Handoffs are loaded, never assumed.** CTH comments are thread-scoped, so
+  only the focused issue or PR has its comments fetched. Every other row reports
+  `not_loaded` with the reason; a thread whose comments *were* loaded and carried
+  no CTH says exactly that. A comment-source failure degrades the handoff alone —
+  the linkage tables still render.
+* **Unrecognised handoff headings are reported, not republished.** A `## CTH:`
+  heading outside `CTH_TYPES` renders as `unrecognized`.
+* **Redaction precedes display.** Titles, labels, handoff fields, and error
+  reasons pass through `webui.console_redaction` before serialization, and the
+  page HTML-escapes everything it renders.
+* **Deep links are opt-in.** A link out to the Gitea web UI appears only when
+  `GITEA_MCP_REVEAL_ENDPOINTS=1` is set server-side, matching how the MCP tools
+  gate URL exposure. Item numbers stay usable without it.
+
 ## System-health dashboard (#639)
 
 `/system-health` renders the same snapshot the `/api/v1/system/health` API

gitea_mcp_server.py

@@ -2069,7 +2069,6 @@ import lease_policy  # noqa: E402
 import workflow_dashboard  # noqa: E402  # #605 live queue/lease dashboard
 import restart_coordinator  # noqa: E402  # #658 MCP restart coordinator/impact
 import drain_proof  # noqa: E402  # #661 pre-restart drain proof and hard gate
-import restart_audit  # noqa: E402  # #665 restart audit events + incidents
 import incident_bridge  # noqa: E402
 import sentry_observability  # noqa: E402  (#606 optional Sentry observability)
 import sentry_incident_bridge  # noqa: E402  (#607 Sentry→Gitea incident bridge)
@@ -22751,38 +22750,6 @@ def gitea_request_mcp_restart(
     # and a durable incident is raised. Break-glass is the only bypass and its
     # authorization is read from the environment, never self-asserted.
     payload["apply_supported"] = False
-    # #665: correlation id threads impact preview → apply gate → incidents.
-    correlation_id = restart_audit.new_correlation_id()
-    payload["correlation_id"] = correlation_id
-    auth_user = None
-    try:
-        # remote-only: host override is for operator diagnostics, not required here
-        auth_user = (gitea_whoami(remote=remote) or {}).get("username")
-    except Exception:  # noqa: BLE001 — identity is best-effort for audit
-        auth_user = None
-    preview_audit = restart_audit.record_restart_lifecycle(
-        event_type=restart_audit.EVENT_IMPACT_PREVIEW,
-        outcome=str(report.verdict or "unknown"),
-        correlation_id=correlation_id,
-        remote=remote,
-        org=o,
-        repo=r,
-        requesting_session_id=sid,
-        restart_class=restart_class,
-        profile_name=profile_name,
-        authenticated_username=auth_user,
-        reasons=list(report.reasons or []),
-        details={
-            "dry_run": True,
-            "allow_restart": bool(report.allow_restart),
-            "inventory_complete": inventory_complete,
-        },
-        privileged=False,
-    )
-    payload["restart_audit"] = {
-        "correlation_id": correlation_id,
-        "impact_preview_written": preview_audit["audit_written"],
-    }
     if not dry_run:
         proof_obj: dict | None = None
         proof_parse_error: str | None = None
@@ -22842,86 +22809,6 @@ def gitea_request_mcp_restart(
         )
         if not gate.allow and gate.incident is not None:
             payload["incident"] = gate.incident
-
-        # #665: audit apply-gate + materialize durable incidents for failed
-        # drain and break-glass. Privileged apply denies if audit is enabled
-        # and the sink write fails.
-        incident_desc = restart_audit.incident_from_apply_gate(
-            gate_payload={
-                **gate_payload,
-                "incident": gate.incident,
-                "allow": gate.allow,
-            },
-            break_glass=break_glass,
-            correlation_id=correlation_id,
-            requesting_session_id=sid,
-            restart_class=restart_class,
-            remote=remote,
-            org=o,
-            repo=r,
-        )
-        if incident_desc is not None:
-            payload["incident"] = incident_desc
-
-        def _create_restart_incident_issue(
-            *, title, body, labels, org=None, repo=None, **_kw
-        ):
-            return gitea_create_issue(
-                title=title,
-                body=body,
-                labels=labels,
-                remote=remote,
-                host=h,
-                org=org or o,
-                repo=repo or r,
-            )
-
-        apply_audit = restart_audit.record_restart_lifecycle(
-            event_type=(
-                restart_audit.EVENT_BREAK_GLASS
-                if break_glass
-                else restart_audit.EVENT_APPLY_GATE
-            ),
-            outcome=(
-                "break_glass"
-                if break_glass
-                else ("allow" if payload["apply_authorized"] else "deny")
-            ),
-            correlation_id=correlation_id,
-            remote=remote,
-            org=o,
-            repo=r,
-            requesting_session_id=sid,
-            restart_class=restart_class,
-            profile_name=profile_name,
-            authenticated_username=auth_user,
-            reasons=list(gate_payload.get("reasons") or []),
-            details={
-                "apply_authorized": payload["apply_authorized"],
-                "drain_gate_allow": gate_payload.get("drain_gate_allow"),
-                "restart_class_authorized": restart_class_authorized,
-                "break_glass": break_glass,
-                "proof_id": gate_payload.get("proof_id"),
-            },
-            privileged=True,
-            create_incident=incident_desc,
-            create_issue_fn=_create_restart_incident_issue
-            if incident_desc is not None
-            else None,
-            dry_run_incident=False,
-        )
-        payload["restart_audit"] = {
-            "correlation_id": correlation_id,
-            "impact_preview_written": preview_audit["audit_written"],
-            "apply_gate_written": apply_audit["audit_written"],
-            "incident_result": apply_audit.get("incident_result"),
-        }
-        if apply_audit["deny_reasons"]:
-            payload["apply_authorized"] = False
-            payload["reasons"] = list(payload.get("reasons") or []) + list(
-                apply_audit["deny_reasons"]
-            )
-            payload["success"] = True
     return payload
 
 

restart_audit.py

@@ -1,426 +0,0 @@
-"""MCP restart lifecycle audit events and incident materialization (#665).
-
-Restarts and recovery attempts must leave a forensic trail: impact previews,
-drain enter/exit, drain-proof results, apply gate verdicts, break-glass, and
-post-restart reconcile outcomes. Failed drains and break-glass must also raise
-durable Gitea incident issues so they cannot be silently repeated.
-
-This module is the pure + sink layer for that trail:
-
-* **Schema** — ``mcp.restart.*`` event names and a redacted payload builder.
-* **Emission** — append-only via :mod:`gitea_audit` (off when ``GITEA_AUDIT_LOG``
-  is unset; privileged apply can still *require* a successful write).
-* **Incidents** — descriptors for failed drain / break-glass / unguarded restart,
-  plus an optional materializer that creates a Gitea issue through an injected
-  ``create_issue_fn`` (keeps this module free of network I/O in tests).
-
-Design rules:
-
-* **No secrets.** All free text is redacted before write or issue body assembly.
-* **Never raises from emission.** ``emit_restart_event`` returns False on sink
-  failure so callers can decide fail-closed policy for privileged restarts.
-* **Does not restart.** Audit never executes a process restart.
-* **Drain proof stays #661.** This module records what the gate decided; it
-  does not re-verify proofs.
-"""
-
-from __future__ import annotations
-
-import uuid
-from datetime import datetime, timezone
-from typing import Any, Callable, Mapping, Sequence
-
-import gitea_audit
-
-# ── Event vocabulary (stable identifiers for operators + tests) ───────────────
-
-EVENT_IMPACT_PREVIEW = "mcp.restart.impact_preview"
-EVENT_DRAIN_ENTER = "mcp.restart.drain_enter"
-EVENT_DRAIN_EXIT = "mcp.restart.drain_exit"
-EVENT_DRAIN_PROOF = "mcp.restart.drain_proof"
-EVENT_APPLY_GATE = "mcp.restart.apply_gate"
-EVENT_BREAK_GLASS = "mcp.restart.break_glass"
-EVENT_POST_RESTART_RECONCILE = "mcp.restart.post_restart_reconcile"
-EVENT_NARROWER_RECOVERY = "mcp.restart.narrower_recovery"
-EVENT_UNGUARDED_DETECTED = "mcp.restart.unguarded_detected"
-
-RESTART_EVENT_TYPES: frozenset[str] = frozenset(
-    {
-        EVENT_IMPACT_PREVIEW,
-        EVENT_DRAIN_ENTER,
-        EVENT_DRAIN_EXIT,
-        EVENT_DRAIN_PROOF,
-        EVENT_APPLY_GATE,
-        EVENT_BREAK_GLASS,
-        EVENT_POST_RESTART_RECONCILE,
-        EVENT_NARROWER_RECOVERY,
-        EVENT_UNGUARDED_DETECTED,
-    }
-)
-
-# Incident kinds (durable Gitea issues).
-INCIDENT_FAILED_DRAIN = "restart_failed_drain"
-INCIDENT_BREAK_GLASS = "restart_break_glass"
-INCIDENT_RECONCILE_UNRESOLVED = "restart_reconcile_unresolved"
-INCIDENT_UNGUARDED = "restart_unguarded_detected"
-
-DEFAULT_INCIDENT_LABELS: tuple[str, ...] = (
-    "mcp-health",
-    "safety",
-    "observability",
-    "status:ready",
-    "type:bug",
-    "workflow-hardening",
-)
-
-CreateIssueFn = Callable[..., dict[str, Any]]
-
-
-def _utc_now_iso() -> str:
-    return datetime.now(timezone.utc).isoformat()
-
-
-def new_correlation_id() -> str:
-    """Mint a short correlation id shared across a restart lifecycle."""
-    return f"rst-{uuid.uuid4().hex[:16]}"
-
-
-def build_restart_event(
-    *,
-    event_type: str,
-    outcome: str,
-    correlation_id: str | None = None,
-    remote: str | None = None,
-    org: str | None = None,
-    repo: str | None = None,
-    requesting_session_id: str | None = None,
-    restart_class: str | None = None,
-    profile_name: str | None = None,
-    authenticated_username: str | None = None,
-    reasons: Sequence[str] | None = None,
-    details: Mapping[str, Any] | None = None,
-    now: str | None = None,
-) -> dict[str, Any]:
-    """Build a redacted ``mcp.restart.*`` audit event.
-
-    Raises ``ValueError`` on unknown event types so a typo cannot silently land
-    under a free-form action name.
-    """
-    name = str(event_type or "").strip()
-    if name not in RESTART_EVENT_TYPES:
-        raise ValueError(
-            f"unknown restart audit event_type {name!r}; expected one of "
-            f"{sorted(RESTART_EVENT_TYPES)}"
-        )
-    redacted_reasons = [
-        gitea_audit.redact(str(r)) for r in (reasons or []) if str(r).strip()
-    ]
-    redacted_details = gitea_audit.redact(dict(details or {}))
-    if not isinstance(redacted_details, dict):
-        redacted_details = {"value": redacted_details}
-
-    event = gitea_audit.build_event(
-        action=name,
-        result=str(outcome or "unknown"),
-        remote=remote,
-        repository=f"{org}/{repo}" if org and repo else None,
-        profile_name=profile_name,
-        authenticated_username=authenticated_username,
-        reason="; ".join(redacted_reasons) if redacted_reasons else None,
-        request_metadata={
-            "event_family": "mcp.restart",
-            "correlation_id": correlation_id or new_correlation_id(),
-            "restart_class": restart_class,
-            "requesting_session_id": requesting_session_id,
-            "org": org,
-            "repo": repo,
-            "details": redacted_details,
-            "reasons": redacted_reasons,
-        },
-        now=now or _utc_now_iso(),
-        operation=name,
-    )
-    event["action_type"] = "restart_lifecycle"
-    event["event_type"] = name
-    event["correlation_id"] = (event.get("request_metadata") or {}).get(
-        "correlation_id"
-    )
-    return event
-
-
-def emit_restart_event(event: Mapping[str, Any], *, path: str | None = None) -> bool:
-    """Append *event* to the audit sink. Never raises. Returns write success."""
-    try:
-        return bool(gitea_audit.write_event(dict(event), path=path))
-    except Exception:
-        return False
-
-
-def require_audit_or_deny(
-    *,
-    privileged: bool,
-    written: bool,
-    audit_enabled: bool | None = None,
-) -> list[str]:
-    """Return deny reasons when a privileged restart path fails to audit.
-
-    When audit is not configured (``GITEA_AUDIT_LOG`` unset), privileged apply
-    still proceeds under the rollout policy "enable audit before enforcing
-    deny-on-audit-fail" — but *if* audit is enabled and the write fails,
-    privileged apply is denied (fail closed).
-    """
-    enabled = (
-        gitea_audit.audit_enabled() if audit_enabled is None else bool(audit_enabled)
-    )
-    if not privileged:
-        return []
-    if not enabled:
-        return []
-    if written:
-        return []
-    return [
-        "privileged restart path requires a successful audit write; "
-        "audit sink failed (fail closed, #665)"
-    ]
-
-
-# ── Incident descriptors ──────────────────────────────────────────────────────
-
-
-def build_incident_descriptor(
-    *,
-    kind: str,
-    reasons: Sequence[str],
-    correlation_id: str | None = None,
-    requesting_session_id: str | None = None,
-    restart_class: str | None = None,
-    remote: str | None = None,
-    org: str | None = None,
-    repo: str | None = None,
-    proof_id: str | None = None,
-    at: str | None = None,
-) -> dict[str, Any]:
-    """Build a durable incident descriptor (no network)."""
-    titles = {
-        INCIDENT_FAILED_DRAIN: "Restart denied: drain proof failed the hard gate",
-        INCIDENT_BREAK_GLASS: "Break-glass MCP restart authorized",
-        INCIDENT_RECONCILE_UNRESOLVED: "Post-restart reconcile left unresolved work",
-        INCIDENT_UNGUARDED: "Unguarded MCP restart attempt detected",
-    }
-    title = titles.get(kind, f"MCP restart incident ({kind})")
-    redacted_reasons = [
-        gitea_audit.redact(str(r)) for r in reasons if str(r).strip()
-    ]
-    return {
-        "kind": kind,
-        "title": title,
-        "labels": list(DEFAULT_INCIDENT_LABELS),
-        "reasons": redacted_reasons,
-        "correlation_id": correlation_id,
-        "requesting_session_id": requesting_session_id,
-        "restart_class": restart_class,
-        "remote": remote,
-        "org": org,
-        "repo": repo,
-        "proof_id": proof_id,
-        "at": at or _utc_now_iso(),
-        "source": "restart_audit#665",
-    }
-
-
-def incident_body(descriptor: Mapping[str, Any]) -> str:
-    """Render a redacted markdown body for a Gitea incident issue."""
-    reasons = descriptor.get("reasons") or []
-    reason_lines = "\n".join(f"- {gitea_audit.redact(str(r))}" for r in reasons) or (
-        "- (no reasons recorded)"
-    )
-    return "\n".join(
-        [
-            "<!-- mcp-restart-incident:v1 -->",
-            f"## MCP restart incident (`{descriptor.get('kind')}`)",
-            "",
-            f"**Correlation:** `{descriptor.get('correlation_id') or 'none'}`",
-            f"**Session:** `{descriptor.get('requesting_session_id') or 'none'}`",
-            f"**Class:** `{descriptor.get('restart_class') or 'none'}`",
-            f"**Scope:** `{descriptor.get('remote')}/{descriptor.get('org')}/"
-            f"{descriptor.get('repo')}`",
-            f"**At:** `{descriptor.get('at')}`",
-            f"**Proof id:** `{descriptor.get('proof_id') or 'none'}`",
-            "",
-            "### Reasons",
-            reason_lines,
-            "",
-            "### Operator next steps",
-            "- Treat this as durable follow-up work under the restart-governance umbrella (#655).",
-            "- Do not invent a second restart path; use sanctioned coordinator tools only.",
-            "- Raw secrets must never appear in this issue (already redacted).",
-            "",
-            f"_Source: {descriptor.get('source')}_",
-        ]
-    )
-
-
-def materialize_incident(
-    descriptor: Mapping[str, Any],
-    *,
-    create_issue_fn: CreateIssueFn | None,
-    dry_run: bool = False,
-) -> dict[str, Any]:
-    """Create a Gitea issue from *descriptor* when *create_issue_fn* is provided.
-
-    Returns a result dict with ``created`` / ``issue_number`` / ``dry_run`` /
-    ``reasons``. Never raises.
-    """
-    base: dict[str, Any] = {
-        "created": False,
-        "dry_run": bool(dry_run),
-        "issue_number": None,
-        "kind": descriptor.get("kind"),
-        "reasons": [],
-        "descriptor": dict(descriptor),
-    }
-    if dry_run:
-        base["reasons"] = ["dry-run only; no Gitea issue created"]
-        return base
-    if create_issue_fn is None:
-        base["reasons"] = [
-            "create_issue_fn not provided; incident descriptor retained only"
-        ]
-        return base
-    try:
-        result = create_issue_fn(
-            title=str(descriptor.get("title") or "MCP restart incident"),
-            body=incident_body(descriptor),
-            labels=list(descriptor.get("labels") or DEFAULT_INCIDENT_LABELS),
-            org=descriptor.get("org"),
-            repo=descriptor.get("repo"),
-        )
-        number = None
-        if isinstance(result, dict):
-            number = result.get("number") or result.get("issue_number")
-        if number is not None:
-            base["created"] = True
-            base["issue_number"] = int(number)
-            base["reasons"] = [f"created incident issue #{int(number)}"]
-        else:
-            base["reasons"] = ["create_issue_fn returned no issue number"]
-    except Exception as exc:  # noqa: BLE001 — never break restart path here
-        base["reasons"] = [
-            f"incident issue creation failed: {gitea_audit.redact(str(exc))}"
-        ]
-    return base
-
-
-def record_restart_lifecycle(
-    *,
-    event_type: str,
-    outcome: str,
-    correlation_id: str,
-    remote: str | None = None,
-    org: str | None = None,
-    repo: str | None = None,
-    requesting_session_id: str | None = None,
-    restart_class: str | None = None,
-    profile_name: str | None = None,
-    authenticated_username: str | None = None,
-    reasons: Sequence[str] | None = None,
-    details: Mapping[str, Any] | None = None,
-    privileged: bool = False,
-    create_incident: Mapping[str, Any] | None = None,
-    create_issue_fn: CreateIssueFn | None = None,
-    dry_run_incident: bool = False,
-    audit_path: str | None = None,
-) -> dict[str, Any]:
-    """Emit one restart audit event and optionally materialize an incident.
-
-    Returns ``{event, audit_written, deny_reasons, incident_result}``.
-    """
-    event = build_restart_event(
-        event_type=event_type,
-        outcome=outcome,
-        correlation_id=correlation_id,
-        remote=remote,
-        org=org,
-        repo=repo,
-        requesting_session_id=requesting_session_id,
-        restart_class=restart_class,
-        profile_name=profile_name,
-        authenticated_username=authenticated_username,
-        reasons=reasons,
-        details=details,
-    )
-    written = emit_restart_event(event, path=audit_path)
-    deny = require_audit_or_deny(privileged=privileged, written=written)
-    incident_result = None
-    if create_incident is not None:
-        incident_result = materialize_incident(
-            create_incident,
-            create_issue_fn=create_issue_fn,
-            dry_run=dry_run_incident,
-        )
-    return {
-        "event": event,
-        "audit_written": written,
-        "deny_reasons": deny,
-        "incident_result": incident_result,
-        "correlation_id": correlation_id,
-    }
-
-
-def incident_from_apply_gate(
-    *,
-    gate_payload: Mapping[str, Any],
-    break_glass: bool,
-    correlation_id: str,
-    requesting_session_id: str | None,
-    restart_class: str | None,
-    remote: str | None,
-    org: str | None,
-    repo: str | None,
-) -> dict[str, Any] | None:
-    """Choose an incident descriptor from an apply-gate payload, if required."""
-    reasons = list(gate_payload.get("reasons") or [])
-    proof_id = gate_payload.get("proof_id")
-    if break_glass:
-        return build_incident_descriptor(
-            kind=INCIDENT_BREAK_GLASS,
-            reasons=reasons
-            or ["break-glass restart path used; durable incident required (#665)"],
-            correlation_id=correlation_id,
-            requesting_session_id=requesting_session_id,
-            restart_class=restart_class,
-            remote=remote,
-            org=org,
-            repo=repo,
-            proof_id=proof_id if isinstance(proof_id, str) else None,
-        )
-    # Failed drain / deny path.
-    incident = gate_payload.get("incident")
-    if isinstance(incident, Mapping) and incident:
-        # Normalize gate-provided descriptor into our schema.
-        return build_incident_descriptor(
-            kind=INCIDENT_FAILED_DRAIN,
-            reasons=list(incident.get("reasons") or reasons),
-            correlation_id=correlation_id,
-            requesting_session_id=requesting_session_id
-            or incident.get("requesting_session_id"),
-            restart_class=restart_class,
-            remote=remote,
-            org=org,
-            repo=repo,
-            proof_id=incident.get("proof_id") or proof_id,
-            at=incident.get("at"),
-        )
-    if not gate_payload.get("allow") and not gate_payload.get("drain_gate_allow", True):
-        return build_incident_descriptor(
-            kind=INCIDENT_FAILED_DRAIN,
-            reasons=reasons or ["restart apply denied"],
-            correlation_id=correlation_id,
-            requesting_session_id=requesting_session_id,
-            restart_class=restart_class,
-            remote=remote,
-            org=org,
-            repo=repo,
-            proof_id=proof_id if isinstance(proof_id, str) else None,
-        )
-    return None

tests/test_restart_audit.py

@@ -1,342 +0,0 @@
-"""Tests for MCP restart lifecycle audit events and incidents (#665)."""
-
-from __future__ import annotations
-
-import json
-import os
-import tempfile
-import unittest
-from unittest.mock import patch
-
-import gitea_audit
-import restart_audit as ra
-
-
-class TestEventSchema(unittest.TestCase):
-    def test_all_lifecycle_event_types_are_named(self):
-        expected = {
-            "mcp.restart.impact_preview",
-            "mcp.restart.drain_enter",
-            "mcp.restart.drain_exit",
-            "mcp.restart.drain_proof",
-            "mcp.restart.apply_gate",
-            "mcp.restart.break_glass",
-            "mcp.restart.post_restart_reconcile",
-            "mcp.restart.narrower_recovery",
-            "mcp.restart.unguarded_detected",
-        }
-        self.assertEqual(set(ra.RESTART_EVENT_TYPES), expected)
-
-    def test_build_restart_event_core_fields(self):
-        event = ra.build_restart_event(
-            event_type=ra.EVENT_IMPACT_PREVIEW,
-            outcome="safe",
-            correlation_id="rst-abc123",
-            remote="prgs",
-            org="Scaled-Tech-Consulting",
-            repo="Gitea-Tools",
-            requesting_session_id="sess-1",
-            restart_class="full_mcp_restart",
-            profile_name="prgs-author",
-            authenticated_username="bot",
-            reasons=["inventory complete"],
-            details={"allow_restart": True},
-            now="2026-07-25T12:00:00+00:00",
-        )
-        self.assertEqual(event["event_type"], ra.EVENT_IMPACT_PREVIEW)
-        self.assertEqual(event["action"], ra.EVENT_IMPACT_PREVIEW)
-        self.assertEqual(event["action_type"], "restart_lifecycle")
-        self.assertEqual(event["result"], "safe")
-        self.assertEqual(event["correlation_id"], "rst-abc123")
-        self.assertEqual(event["profile_name"], "prgs-author")
-        self.assertEqual(event["authenticated_username"], "bot")
-        meta = event["request_metadata"]
-        self.assertEqual(meta["event_family"], "mcp.restart")
-        self.assertEqual(meta["correlation_id"], "rst-abc123")
-        self.assertEqual(meta["restart_class"], "full_mcp_restart")
-        self.assertEqual(meta["details"]["allow_restart"], True)
-
-    def test_unknown_event_type_raises(self):
-        with self.assertRaises(ValueError) as ctx:
-            ra.build_restart_event(
-                event_type="mcp.restart.not_a_real_event",
-                outcome="x",
-                correlation_id="rst-1",
-            )
-        self.assertIn("unknown restart audit event_type", str(ctx.exception))
-
-    def test_reasons_and_details_are_redacted(self):
-        event = ra.build_restart_event(
-            event_type=ra.EVENT_APPLY_GATE,
-            outcome="deny",
-            correlation_id="rst-sec",
-            reasons=["token secret-xyz rejected", "ok"],
-            details={"token": "leak-token", "status": "denied"},
-        )
-        self.assertNotIn("secret-xyz", event.get("reason") or "")
-        meta = event["request_metadata"]
-        self.assertEqual(meta["details"]["token"], gitea_audit.REDACTED)
-        self.assertEqual(meta["details"]["status"], "denied")
-        for reason in meta["reasons"]:
-            self.assertNotIn("secret-xyz", reason)
-
-    def test_new_correlation_id_shape(self):
-        cid = ra.new_correlation_id()
-        self.assertTrue(cid.startswith("rst-"))
-        self.assertEqual(len(cid), len("rst-") + 16)
-
-
-class TestEmitAndRequire(unittest.TestCase):
-    def test_emit_appends_json_line(self):
-        with tempfile.TemporaryDirectory() as d:
-            path = os.path.join(d, "audit.log")
-            event = ra.build_restart_event(
-                event_type=ra.EVENT_DRAIN_PROOF,
-                outcome="pass",
-                correlation_id="rst-write",
-            )
-            self.assertTrue(ra.emit_restart_event(event, path=path))
-            with open(path, encoding="utf-8") as fh:
-                lines = fh.read().splitlines()
-            self.assertEqual(len(lines), 1)
-            loaded = json.loads(lines[0])
-            self.assertEqual(loaded["event_type"], ra.EVENT_DRAIN_PROOF)
-            self.assertEqual(loaded["correlation_id"], "rst-write")
-
-    def test_emit_never_raises(self):
-        self.assertFalse(
-            ra.emit_restart_event({"action": "x"}, path="/no/such/dir/audit.log")
-        )
-
-    def test_require_audit_denies_privileged_when_write_fails_and_enabled(self):
-        deny = ra.require_audit_or_deny(
-            privileged=True, written=False, audit_enabled=True
-        )
-        self.assertEqual(len(deny), 1)
-        self.assertIn("fail closed", deny[0])
-
-    def test_require_audit_allows_when_audit_disabled(self):
-        # Rollout policy: enable audit before enforcing deny-on-audit-fail.
-        deny = ra.require_audit_or_deny(
-            privileged=True, written=False, audit_enabled=False
-        )
-        self.assertEqual(deny, [])
-
-    def test_require_audit_noop_for_non_privileged(self):
-        deny = ra.require_audit_or_deny(
-            privileged=False, written=False, audit_enabled=True
-        )
-        self.assertEqual(deny, [])
-
-    def test_require_audit_allows_when_written(self):
-        deny = ra.require_audit_or_deny(
-            privileged=True, written=True, audit_enabled=True
-        )
-        self.assertEqual(deny, [])
-
-
-class TestIncidents(unittest.TestCase):
-    def test_break_glass_descriptor(self):
-        desc = ra.build_incident_descriptor(
-            kind=ra.INCIDENT_BREAK_GLASS,
-            reasons=["break-glass authorized"],
-            correlation_id="rst-bg",
-            requesting_session_id="s1",
-            restart_class="full_mcp_restart",
-            remote="prgs",
-            org="O",
-            repo="R",
-        )
-        self.assertEqual(desc["kind"], ra.INCIDENT_BREAK_GLASS)
-        self.assertIn("Break-glass", desc["title"])
-        self.assertIn("mcp-health", desc["labels"])
-        self.assertEqual(desc["source"], "restart_audit#665")
-
-    def test_incident_body_redacts_and_includes_correlation(self):
-        desc = ra.build_incident_descriptor(
-            kind=ra.INCIDENT_FAILED_DRAIN,
-            reasons=["token secret-xyz failed proof"],
-            correlation_id="rst-body",
-            remote="prgs",
-            org="O",
-            repo="R",
-            proof_id="proof-1",
-        )
-        body = ra.incident_body(desc)
-        self.assertIn("rst-body", body)
-        self.assertIn("proof-1", body)
-        self.assertIn("mcp-restart-incident:v1", body)
-        self.assertNotIn("secret-xyz", body)
-
-    def test_materialize_dry_run(self):
-        desc = ra.build_incident_descriptor(
-            kind=ra.INCIDENT_FAILED_DRAIN,
-            reasons=["denied"],
-            correlation_id="rst-dr",
-        )
-        result = ra.materialize_incident(desc, create_issue_fn=lambda **k: {}, dry_run=True)
-        self.assertFalse(result["created"])
-        self.assertTrue(result["dry_run"])
-        self.assertIn("dry-run", result["reasons"][0])
-
-    def test_materialize_without_create_fn(self):
-        desc = ra.build_incident_descriptor(
-            kind=ra.INCIDENT_FAILED_DRAIN,
-            reasons=["denied"],
-            correlation_id="rst-nfn",
-        )
-        result = ra.materialize_incident(desc, create_issue_fn=None)
-        self.assertFalse(result["created"])
-        self.assertIn("create_issue_fn not provided", result["reasons"][0])
-
-    def test_materialize_creates_issue(self):
-        created = {}
-
-        def _create(*, title, body, labels, org=None, repo=None, **_kw):
-            created["title"] = title
-            created["body"] = body
-            created["labels"] = labels
-            created["org"] = org
-            created["repo"] = repo
-            return {"number": 999}
-
-        desc = ra.build_incident_descriptor(
-            kind=ra.INCIDENT_BREAK_GLASS,
-            reasons=["break-glass"],
-            correlation_id="rst-create",
-            org="O",
-            repo="R",
-        )
-        result = ra.materialize_incident(desc, create_issue_fn=_create)
-        self.assertTrue(result["created"])
-        self.assertEqual(result["issue_number"], 999)
-        self.assertIn("Break-glass", created["title"])
-        self.assertIn("rst-create", created["body"])
-        self.assertEqual(created["org"], "O")
-
-    def test_materialize_never_raises_on_create_failure(self):
-        def _boom(**_kw):
-            raise RuntimeError("token secret-xyz network")
-
-        desc = ra.build_incident_descriptor(
-            kind=ra.INCIDENT_FAILED_DRAIN,
-            reasons=["x"],
-            correlation_id="rst-boom",
-        )
-        result = ra.materialize_incident(desc, create_issue_fn=_boom)
-        self.assertFalse(result["created"])
-        self.assertIn("failed", result["reasons"][0])
-        self.assertNotIn("secret-xyz", result["reasons"][0])
-
-
-class TestIncidentFromApplyGate(unittest.TestCase):
-    def test_break_glass_always_incident(self):
-        desc = ra.incident_from_apply_gate(
-            gate_payload={"allow": True, "reasons": [], "proof_id": None},
-            break_glass=True,
-            correlation_id="rst-bg2",
-            requesting_session_id="s",
-            restart_class="full_mcp_restart",
-            remote="prgs",
-            org="O",
-            repo="R",
-        )
-        self.assertIsNotNone(desc)
-        self.assertEqual(desc["kind"], ra.INCIDENT_BREAK_GLASS)
-
-    def test_failed_drain_from_gate_incident(self):
-        desc = ra.incident_from_apply_gate(
-            gate_payload={
-                "allow": False,
-                "drain_gate_allow": False,
-                "reasons": ["proof expired"],
-                "incident": {
-                    "reasons": ["proof expired"],
-                    "proof_id": "p1",
-                },
-            },
-            break_glass=False,
-            correlation_id="rst-fd",
-            requesting_session_id="s",
-            restart_class="full_mcp_restart",
-            remote="prgs",
-            org="O",
-            repo="R",
-        )
-        self.assertIsNotNone(desc)
-        self.assertEqual(desc["kind"], ra.INCIDENT_FAILED_DRAIN)
-        self.assertEqual(desc["proof_id"], "p1")
-
-    def test_allow_without_break_glass_no_incident(self):
-        desc = ra.incident_from_apply_gate(
-            gate_payload={
-                "allow": True,
-                "drain_gate_allow": True,
-                "reasons": [],
-            },
-            break_glass=False,
-            correlation_id="rst-ok",
-            requesting_session_id="s",
-            restart_class="full_mcp_restart",
-            remote="prgs",
-            org="O",
-            repo="R",
-        )
-        self.assertIsNone(desc)
-
-
-class TestRecordLifecycle(unittest.TestCase):
-    def test_record_emits_and_materializes(self):
-        created = []
-
-        def _create(**kwargs):
-            created.append(kwargs)
-            return {"number": 42}
-
-        with tempfile.TemporaryDirectory() as d:
-            path = os.path.join(d, "audit.log")
-            with patch.dict(os.environ, {"GITEA_AUDIT_LOG": path}, clear=False):
-                incident = ra.build_incident_descriptor(
-                    kind=ra.INCIDENT_BREAK_GLASS,
-                    reasons=["bg"],
-                    correlation_id="rst-lc",
-                    org="O",
-                    repo="R",
-                )
-                out = ra.record_restart_lifecycle(
-                    event_type=ra.EVENT_BREAK_GLASS,
-                    outcome="break_glass",
-                    correlation_id="rst-lc",
-                    remote="prgs",
-                    org="O",
-                    repo="R",
-                    privileged=True,
-                    create_incident=incident,
-                    create_issue_fn=_create,
-                    audit_path=path,
-                )
-        self.assertTrue(out["audit_written"])
-        self.assertEqual(out["deny_reasons"], [])
-        self.assertTrue(out["incident_result"]["created"])
-        self.assertEqual(out["incident_result"]["issue_number"], 42)
-        self.assertEqual(len(created), 1)
-
-    def test_privileged_deny_when_audit_write_fails(self):
-        with patch.dict(
-            os.environ, {"GITEA_AUDIT_LOG": "/no/such/dir/a.log"}, clear=False
-        ):
-            with patch("restart_audit.emit_restart_event", return_value=False):
-                with patch("gitea_audit.audit_enabled", return_value=True):
-                    out = ra.record_restart_lifecycle(
-                        event_type=ra.EVENT_APPLY_GATE,
-                        outcome="deny",
-                        correlation_id="rst-deny",
-                        privileged=True,
-                        audit_path="/no/such/dir/a.log",
-                    )
-        self.assertFalse(out["audit_written"])
-        self.assertEqual(len(out["deny_reasons"]), 1)
-
-
-if __name__ == "__main__":
-    unittest.main()

tests/test_webui_gitea_linkage.py

@@ -0,0 +1,511 @@
+"""Tests for the Gitea issue↔PR linkage console (#645, Phase 3).
+
+Covers the acceptance criteria of the issue:
+
+* AC1 — issue↔PR linkage is visible for the selected project/repo, in both
+  directions, with the evidence that produced each edge.
+* AC2 — the latest canonical handoff (CTH) is summarized for a focused thread.
+* AC3 — an external Gitea link appears only under the admin reveal opt-in.
+* AC4 — every case is driven by mocked Gitea payloads; no network.
+
+Plus the invariants this console must not violate: a partial or failed read is
+never rendered as "no link exists", an unfetched thread is never rendered as
+"no handoff", redaction happens before display, and the surface stays read-only.
+"""
+
+from __future__ import annotations
+
+import json
+import os
+import sys
+import unittest
+from pathlib import Path
+from unittest import mock
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from tests.webui_testclient import TestClient
+
+from canonical_thread_handoff import format_cth_body
+from webui.app import create_app
+from webui.linkage_loader import (
+    EVIDENCE_BRANCH,
+    EVIDENCE_CLOSES,
+    EVIDENCE_REFERENCE,
+    HANDOFF_LOADED,
+    HANDOFF_NOT_LOADED,
+    HANDOFF_UNAVAILABLE,
+    LinkageSnapshot,
+    load_linkage_snapshot,
+    resolve_linkage,
+    resolve_pr_links,
+    snapshot_to_dict,
+    summarize_handoff,
+)
+from webui.linkage_views import render_linkage_page
+from webui.nav import nav_hrefs
+from webui.queue_loader import PaginationMeta
+
+
+def _pagination(*, complete: bool = True, count: int = 0) -> PaginationMeta:
+    return PaginationMeta(
+        page=1,
+        per_page=50,
+        returned_count=count,
+        has_more=not complete,
+        is_final_page=complete,
+        inventory_complete=complete,
+        pages_fetched=1,
+    )
+
+
+def _pr(
+    number: int,
+    *,
+    title: str = "",
+    body: str = "",
+    head: str = "",
+    state: str = "open",
+    labels: tuple[str, ...] = (),
+) -> dict:
+    return {
+        "number": number,
+        "title": title or f"pr {number}",
+        "body": body,
+        "state": state,
+        "head": {"ref": head},
+        "labels": [{"name": name} for name in labels],
+    }
+
+
+def _issue(
+    number: int,
+    *,
+    title: str = "",
+    state: str = "open",
+    labels: tuple[str, ...] = (),
+) -> dict:
+    return {
+        "number": number,
+        "title": title or f"issue {number}",
+        "state": state,
+        "labels": [{"name": name} for name in labels],
+    }
+
+
+def _fetcher(items: list[dict], *, complete: bool = True):
+    def _fetch(*_args, **_kwargs):
+        return items, _pagination(complete=complete, count=len(items))
+
+    return _fetch
+
+
+def _load(
+    issues: list[dict],
+    prs: list[dict],
+    *,
+    complete: bool = True,
+    **kwargs,
+) -> LinkageSnapshot:
+    return load_linkage_snapshot(
+        fetch_prs=_fetcher(prs, complete=complete),
+        fetch_issues=_fetcher(issues, complete=complete),
+        **kwargs,
+    )
+
+
+def _cth(comment_id: int, *, created_at: str, status: str, next_owner: str) -> dict:
+    return {
+        "id": comment_id,
+        "created_at": created_at,
+        "user": {"login": "jcwalker3"},
+        "body": format_cth_body(
+            cth_type="Author Handoff",
+            status=status,
+            next_owner=next_owner,
+            current_blocker="none",
+            decision="implemented",
+            proof="full suite green",
+            next_action="review PR",
+            ready_to_paste_prompt="Review PR #902 now.",
+        ),
+    }
+
+
+class TestLinkageEvidence(unittest.TestCase):
+    """AC1 — every edge records how it was found, and keeps all candidates."""
+
+    def test_closes_keyword_in_body_is_strongest_evidence(self):
+        links = resolve_pr_links(_pr(902, body="Closes #643"))
+        self.assertEqual([link.issue_number for link in links], [643])
+        self.assertEqual(links[0].evidence, (EVIDENCE_CLOSES,))
+        self.assertTrue(links[0].closes)
+
+    def test_closes_keyword_in_title_counts(self):
+        links = resolve_pr_links(_pr(902, title="feat(webui): preview (Closes #643)"))
+        self.assertEqual(links[0].evidence, (EVIDENCE_CLOSES,))
+
+    def test_canonical_branch_marker_links_without_a_keyword(self):
+        links = resolve_pr_links(_pr(902, head="feat/issue-643-request-preview"))
+        self.assertEqual([link.issue_number for link in links], [643])
+        self.assertEqual(links[0].evidence, (EVIDENCE_BRANCH,))
+        self.assertFalse(links[0].closes)
+
+    def test_non_canonical_branch_is_not_treated_as_a_marker(self):
+        self.assertEqual(resolve_pr_links(_pr(902, head="issue-643-preview")), ())
+
+    def test_bare_mention_is_recorded_as_the_weakest_evidence(self):
+        links = resolve_pr_links(_pr(902, body="context in #643"))
+        self.assertEqual(links[0].evidence, (EVIDENCE_REFERENCE,))
+        self.assertFalse(links[0].closes)
+
+    def test_several_evidence_kinds_merge_onto_one_edge(self):
+        links = resolve_pr_links(
+            _pr(902, body="Closes #643 — see #643", head="feat/issue-643-preview")
+        )
+        self.assertEqual(len(links), 1)
+        self.assertEqual(
+            links[0].evidence,
+            (EVIDENCE_CLOSES, EVIDENCE_BRANCH, EVIDENCE_REFERENCE),
+        )
+
+    def test_stronger_evidence_sorts_first(self):
+        links = resolve_pr_links(_pr(902, body="Closes #643, related #700"))
+        self.assertEqual([link.issue_number for link in links], [643, 700])
+
+    def test_self_reference_is_not_linkage(self):
+        links = resolve_pr_links(_pr(902, body="supersedes #902"))
+        self.assertEqual(links, ())
+
+    def test_every_candidate_is_kept_never_collapsed_to_a_guess(self):
+        links = resolve_pr_links(_pr(902, body="Closes #643\nCloses #644"))
+        self.assertEqual([link.issue_number for link in links], [643, 644])
+
+
+class TestLinkageIndex(unittest.TestCase):
+    def test_issue_direction_ignores_mention_only_edges(self):
+        index = resolve_linkage([_pr(902, body="context in #643")])
+        self.assertIsNone(index.issue_prs.get(643))
+        self.assertEqual(index.pr_links[902][0].evidence, (EVIDENCE_REFERENCE,))
+
+    def test_contested_issue_is_reported_when_two_prs_claim_it(self):
+        index = resolve_linkage(
+            [_pr(902, body="Closes #643"), _pr(903, head="feat/issue-643-again")]
+        )
+        self.assertEqual(index.contested_issues(), (643,))
+        self.assertEqual(index.issue_prs[643], (902, 903))
+
+    def test_single_claim_is_not_contested(self):
+        index = resolve_linkage([_pr(902, body="Closes #643")])
+        self.assertEqual(index.contested_issues(), ())
+
+    def test_ambiguous_when_two_issues_tie_at_the_strongest_evidence(self):
+        index = resolve_linkage([_pr(902, body="Closes #643\nCloses #644")])
+        self.assertTrue(index.ambiguous(902))
+
+    def test_weaker_candidate_alongside_a_stronger_one_is_not_ambiguous(self):
+        index = resolve_linkage([_pr(902, body="Closes #643, see #700")])
+        self.assertFalse(index.ambiguous(902))
+        self.assertEqual(index.primary_issue(902).issue_number, 643)
+
+    def test_malformed_pr_row_is_skipped_not_raised_on(self):
+        index = resolve_linkage([{"title": "no number"}, _pr(902, body="Closes #643")])
+        self.assertEqual(sorted(index.pr_links), [902])
+
+
+class TestLinkageSnapshot(unittest.TestCase):
+    """AC1 — linkage is visible per project/repo, in both directions."""
+
+    def test_both_directions_are_populated(self):
+        snapshot = _load([_issue(643)], [_pr(902, body="Closes #643")])
+        self.assertTrue(snapshot.ok)
+        self.assertEqual([node.number for node in snapshot.issues], [643])
+        self.assertEqual(snapshot.issues[0].linked_prs, (902,))
+        self.assertEqual(snapshot.prs[0].links[0].issue_number, 643)
+
+    def test_repo_scope_comes_from_the_registry_project(self):
+        snapshot = _load([], [])
+        self.assertIn("/", snapshot.repo_label)
+        self.assertTrue(snapshot.project_id)
+
+    def test_unknown_project_fails_closed_with_a_reason(self):
+        snapshot = _load([_issue(643)], [], project_id="no-such-project")
+        self.assertFalse(snapshot.ok)
+        self.assertIn("not found in registry", snapshot.fetch_error)
+        self.assertEqual(snapshot.issues, ())
+
+    def test_orphan_pr_is_identifiable(self):
+        snapshot = _load([], [_pr(902), _pr(903, body="Closes #643")])
+        self.assertEqual([node.number for node in snapshot.orphan_prs], [902])
+
+    def test_state_scope_defaults_to_open_and_is_reported(self):
+        self.assertEqual(_load([], []).state_scope, "open")
+        self.assertEqual(_load([], [], state="all").state_scope, "all")
+
+    def test_unsupported_state_falls_back_to_open(self):
+        self.assertEqual(_load([], [], state="../etc").state_scope, "open")
+
+    def test_state_is_passed_through_to_the_fetchers(self):
+        seen: list[str] = []
+
+        def _fetch(*_args, **kwargs):
+            seen.append(kwargs.get("state", ""))
+            return [], _pagination()
+
+        load_linkage_snapshot(state="all", fetch_prs=_fetch, fetch_issues=_fetch)
+        self.assertEqual(seen, ["all", "all"])
+
+
+class TestPartialInventoryIsNotAnAbsenceClaim(unittest.TestCase):
+    """An empty edge list from a partial read must never read as 'no link'."""
+
+    def test_incomplete_pagination_marks_links_non_authoritative(self):
+        snapshot = _load([_issue(643)], [], complete=False)
+        self.assertFalse(snapshot.inventory_complete)
+        self.assertFalse(snapshot.issues[0].links_authoritative)
+
+    def test_complete_pagination_marks_links_authoritative(self):
+        snapshot = _load([_issue(643)], [], complete=True)
+        self.assertTrue(snapshot.inventory_complete)
+        self.assertTrue(snapshot.issues[0].links_authoritative)
+
+    def test_partial_window_renders_a_qualified_empty_cell(self):
+        html = render_linkage_page(_load([_issue(643)], [], complete=False))
+        self.assertIn("none found (partial inventory)", html)
+
+    def test_complete_window_renders_a_plain_none(self):
+        html = render_linkage_page(_load([_issue(643)], [], complete=True))
+        self.assertNotIn("partial inventory", html)
+        self.assertIn(">none<", html)
+
+    def test_missing_credentials_fail_closed_without_a_table(self):
+        with mock.patch(
+            "webui.linkage_loader._offline_test_mode", return_value=False
+        ), mock.patch("webui.linkage_loader.get_auth_header", return_value=""):
+            snapshot = load_linkage_snapshot()
+        self.assertFalse(snapshot.ok)
+        self.assertIn("credentials unavailable", snapshot.fetch_error)
+        html = render_linkage_page(snapshot)
+        self.assertIn("Linkage unavailable", html)
+        self.assertNotIn("Issues → pull requests", html)
+
+    def test_fetch_failure_is_reported_not_raised(self):
+        def _boom(*_args, **_kwargs):
+            raise RuntimeError("gitea 502")
+
+        snapshot = load_linkage_snapshot(fetch_prs=_boom, fetch_issues=_boom)
+        self.assertFalse(snapshot.ok)
+        self.assertIn("Gitea fetch failed", snapshot.fetch_error)
+
+
+class TestHandoffSummary(unittest.TestCase):
+    """AC2 — the latest canonical handoff is summarized for a focused thread."""
+
+    def test_latest_cth_wins(self):
+        summary = summarize_handoff([
+            _cth(1, created_at="2026-07-24T10:00:00Z", status="in progress",
+                 next_owner="author"),
+            _cth(2, created_at="2026-07-25T10:00:00Z", status="PR-open",
+                 next_owner="reviewer"),
+        ])
+        self.assertEqual(summary.comment_id, 2)
+        self.assertEqual(summary.status, "PR-open")
+        self.assertEqual(summary.next_owner, "reviewer")
+        self.assertTrue(summary.cth_type_known)
+
+    def test_thread_without_a_cth_summarizes_to_none(self):
+        self.assertIsNone(summarize_handoff([{"id": 1, "body": "ordinary comment"}]))
+
+    def test_unknown_heading_is_reported_not_republished(self):
+        summary = summarize_handoff([
+            {
+                "id": 5,
+                "created_at": "2026-07-25T10:00:00Z",
+                "user": {"login": "someone"},
+                "body": "<!-- cth:v1 -->\n## CTH: Totally Made Up\n\nStatus: odd\n",
+            }
+        ])
+        self.assertFalse(summary.cth_type_known)
+        self.assertEqual(summary.cth_type, "unrecognized")
+        self.assertNotIn("Totally Made Up", json.dumps(summary.to_dict()))
+
+    def test_focused_pr_loads_its_handoff(self):
+        snapshot = _load(
+            [_issue(643)],
+            [_pr(902, body="Closes #643")],
+            pr=902,
+            comment_source=lambda kind, number: [
+                _cth(2, created_at="2026-07-25T10:00:00Z", status="PR-open",
+                     next_owner="reviewer")
+            ],
+        )
+        self.assertEqual(snapshot.handoff_status.state, HANDOFF_LOADED)
+        self.assertEqual(snapshot.focus, ("pr", 902))
+        self.assertEqual(snapshot.prs[0].handoff.status, "PR-open")
+
+    def test_unfocused_rows_report_not_loaded_never_none(self):
+        snapshot = _load(
+            [_issue(643)],
+            [_pr(902, body="Closes #643"), _pr(903)],
+            pr=902,
+            comment_source=lambda kind, number: [],
+        )
+        other = next(node for node in snapshot.prs if node.number == 903)
+        self.assertIsNone(other.handoff)
+        self.assertEqual(other.handoff_status.state, HANDOFF_NOT_LOADED)
+        self.assertIn("not loaded", render_linkage_page(snapshot))
+
+    def test_no_focus_means_no_thread_is_claimed_handoff_free(self):
+        snapshot = _load([_issue(643)], [])
+        self.assertEqual(snapshot.handoff_status.state, HANDOFF_NOT_LOADED)
+        self.assertIn("thread-scoped", snapshot.handoff_status.reason)
+
+    def test_comment_source_failure_degrades_only_the_handoff(self):
+        def _boom(_kind, _number):
+            raise RuntimeError("comments 500")
+
+        snapshot = _load(
+            [_issue(643)], [_pr(902, body="Closes #643")], pr=902, comment_source=_boom
+        )
+        self.assertTrue(snapshot.ok)
+        self.assertEqual(snapshot.handoff_status.state, HANDOFF_UNAVAILABLE)
+        self.assertEqual(snapshot.issues[0].linked_prs, (902,))
+        self.assertIn("unavailable", render_linkage_page(snapshot))
+
+    def test_loaded_thread_with_no_cth_says_so_explicitly(self):
+        snapshot = _load(
+            [_issue(643)],
+            [_pr(902, body="Closes #643")],
+            pr=902,
+            comment_source=lambda kind, number: [{"id": 1, "body": "hi"}],
+        )
+        self.assertIn(
+            "no Canonical Thread Handoff comment found", render_linkage_page(snapshot)
+        )
+
+
+class TestDeepLinks(unittest.TestCase):
+    """AC3 — an external Gitea link is emitted only when permitted."""
+
+    def test_deep_links_are_withheld_by_default(self):
+        with mock.patch.dict(os.environ, {"GITEA_MCP_REVEAL_ENDPOINTS": ""}):
+            snapshot = _load([_issue(643)], [])
+            html = render_linkage_page(snapshot)
+        self.assertFalse(snapshot.deep_links_enabled)
+        self.assertIsNone(snapshot.issues[0].deep_link)
+        self.assertIn("Gitea deep links are withheld", html)
+
+    def test_reveal_opt_in_emits_the_link(self):
+        with mock.patch.dict(os.environ, {"GITEA_MCP_REVEAL_ENDPOINTS": "1"}):
+            snapshot = _load([_issue(643)], [_pr(902, body="Closes #643")])
+            html = render_linkage_page(snapshot)
+        self.assertTrue(snapshot.deep_links_enabled)
+        self.assertIn("/issues/643", snapshot.issues[0].deep_link)
+        self.assertIn("/pulls/902", snapshot.prs[0].deep_link)
+        self.assertIn(f'href="{snapshot.issues[0].deep_link}"', html)
+
+
+class TestRedactionBoundary(unittest.TestCase):
+    def test_secret_shaped_title_is_redacted_before_display(self):
+        snapshot = _load(
+            [_issue(643, title="token=ghp_thisisnotarealsecretvalue0001")], []
+        )
+        payload = json.dumps(snapshot_to_dict(snapshot))
+        self.assertNotIn("ghp_thisisnotarealsecretvalue0001", payload)
+        self.assertNotIn(
+            "ghp_thisisnotarealsecretvalue0001", render_linkage_page(snapshot)
+        )
+
+    def test_handoff_fields_are_redacted(self):
+        comment = _cth(
+            2, created_at="2026-07-25T10:00:00Z", status="ok", next_owner="reviewer"
+        )
+        comment["body"] += "\nDecision: password=hunter2hunter2\n"
+        snapshot = _load(
+            [_issue(643)],
+            [_pr(902, body="Closes #643")],
+            pr=902,
+            comment_source=lambda kind, number: [comment],
+        )
+        self.assertNotIn("hunter2hunter2", json.dumps(snapshot_to_dict(snapshot)))
+        self.assertNotIn("hunter2hunter2", render_linkage_page(snapshot))
+
+    def test_html_escapes_markup_in_a_title(self):
+        snapshot = _load([_issue(643, title="<script>alert(1)</script>")], [])
+        html = render_linkage_page(snapshot)
+        self.assertNotIn("<script>alert(1)</script>", html)
+        self.assertIn("&lt;script&gt;", html)
+
+
+class TestLinkageRoutes(unittest.TestCase):
+    def setUp(self):
+        self.snapshot = _load(
+            [_issue(643, labels=("status:ready",))],
+            [_pr(902, body="Closes #643", labels=("status:pr-open",))],
+        )
+        self.client = TestClient(create_app())
+
+    def test_page_renders_both_tables(self):
+        with mock.patch("webui.app.load_linkage_snapshot", return_value=self.snapshot):
+            response = self.client.get("/gitea")
+        self.assertEqual(response.status_code, 200)
+        self.assertIn("Issues → pull requests", response.text)
+        self.assertIn("Pull requests → issues", response.text)
+        self.assertIn("#643", response.text)
+
+    def test_api_exports_the_same_model(self):
+        with mock.patch("webui.app.load_linkage_snapshot", return_value=self.snapshot):
+            response = self.client.get("/api/v1/gitea/linkage")
+        self.assertEqual(response.status_code, 200)
+        payload = response.json()
+        self.assertTrue(payload["ok"])
+        self.assertEqual(payload["issues"][0]["linked_prs"], [902])
+        self.assertEqual(payload["prs"][0]["links"][0]["issue_number"], 643)
+        self.assertEqual(payload["schema_version"], 1)
+
+    def test_api_declares_the_evidence_vocabulary(self):
+        with mock.patch("webui.app.load_linkage_snapshot", return_value=self.snapshot):
+            payload = self.client.get("/api/v1/gitea/linkage").json()
+        names = {entry["name"] for entry in payload["evidence_kinds"]}
+        self.assertEqual(names, {EVIDENCE_CLOSES, EVIDENCE_BRANCH, EVIDENCE_REFERENCE})
+
+    def test_api_fails_closed_with_a_non_200_when_the_read_failed(self):
+        failed = _load([], [], project_id="no-such-project")
+        with mock.patch("webui.app.load_linkage_snapshot", return_value=failed):
+            response = self.client.get("/api/v1/gitea/linkage")
+        self.assertEqual(response.status_code, 502)
+        self.assertFalse(response.json()["ok"])
+
+    def test_page_still_renders_when_the_read_failed(self):
+        failed = _load([], [], project_id="no-such-project")
+        with mock.patch("webui.app.load_linkage_snapshot", return_value=failed):
+            response = self.client.get("/gitea")
+        self.assertEqual(response.status_code, 200)
+        self.assertIn("Linkage unavailable", response.text)
+
+    def test_query_parameters_reach_the_loader(self):
+        with mock.patch(
+            "webui.app.load_linkage_snapshot", return_value=self.snapshot
+        ) as loader:
+            self.client.get("/gitea?project=gitea-tools&state=all&pr=902")
+        loader.assert_called_once()
+        args, kwargs = loader.call_args
+        self.assertEqual(args[0], "gitea-tools")
+        self.assertEqual(kwargs["state"], "all")
+        self.assertEqual(kwargs["pr"], 902)
+        self.assertIsNone(kwargs["issue"])
+
+    def test_surface_stays_read_only(self):
+        for path in ("/gitea", "/api/v1/gitea/linkage"):
+            with self.subTest(path=path):
+                self.assertEqual(self.client.post(path).status_code, 405)
+
+    def test_nav_exposes_the_linkage_page_as_live(self):
+        self.assertIn("/gitea", nav_hrefs())
+        home = self.client.get("/").text
+        self.assertIn('href="/gitea"', home)
+        self.assertIn(">Gitea<", home)
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_webui_providers_insights.py

@@ -0,0 +1,404 @@
+"""Tests for AI-provider connections and evidence-backed insights (#650).
+
+Covers acceptance criteria:
+
+1. Provider connection status is redacted and accurate (declared registry only).
+2. At least three insight types with evidence citations.
+3. Insights never claim actions completed without proof.
+4. Evidence requirement is enforced (no evidence-less insights).
+5. Interpretation limits appear in docs-facing payloads.
+"""
+
+from __future__ import annotations
+
+import json
+import sys
+import unittest
+from dataclasses import dataclass
+from pathlib import Path
+from unittest import mock
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from tests.webui_testclient import TestClient
+
+from webui.app import create_app
+from webui.insights_loader import (
+    CONFIDENCE_HIGH,
+    CONNECTION_DECLARED_AVAILABLE,
+    CONNECTION_DECLARED_UNAVAILABLE,
+    INSIGHT_BLOCKED_QUEUE,
+    INSIGHT_CONTROLLER_ATTENTION,
+    INSIGHT_PROVIDER_WITHOUT_WORKERS,
+    INSIGHT_STALE_RUNTIME,
+    ProviderConnection,
+    build_provider_connection,
+    generate_insights,
+    insight_blocked_queue,
+    insight_controller_attention,
+    insight_providers_without_workers,
+    insight_stale_runtime,
+    load_insights_snapshot,
+    load_provider_snapshot,
+    snapshot_insights_to_dict,
+    snapshot_providers_to_dict,
+)
+from webui.insights_views import render_insights_page, render_providers_page
+from webui.nav import STUB_PAGES, nav_hrefs
+from webui.worker_registry import ProviderRecord, WorkerRecord, ScheduleSpec, SchedulerSpec
+
+
+def _provider(
+    provider_id: str = "claude",
+    *,
+    available: bool = True,
+    models: tuple[str, ...] = ("claude-opus-4-8",),
+    notes: str = "",
+) -> ProviderRecord:
+    return ProviderRecord(
+        id=provider_id,
+        display_name=provider_id.title(),
+        vendor="TestVendor",
+        executable=provider_id,
+        available=available,
+        models=models,
+        notes=notes,
+    )
+
+
+def _worker(
+    worker_id: str = "claude-author",
+    *,
+    provider: str = "claude",
+    enabled: bool = True,
+) -> WorkerRecord:
+    return WorkerRecord(
+        id=worker_id,
+        display_name=worker_id,
+        provider=provider,
+        model="m1",
+        project="gitea-tools",
+        role="author",
+        namespace="gitea-author",
+        profile="prgs-author",
+        workflow="skills/llm-project-workflow/workflows/work-issue.md",
+        schedule=ScheduleSpec(kind="manual", seconds=None, expression=None),
+        timeout_seconds=3600,
+        enabled=enabled,
+        scheduler=SchedulerSpec(kind="manual", label=None),
+        notes="",
+    )
+
+
+@dataclass(frozen=True)
+class _TrafficItem:
+    kind: str
+    number: int
+    title: str = ""
+    traffic_state: str = "blocked"
+    expected_role: str = "author"
+    safe_for_roles: tuple[str, ...] = ()
+    badges: tuple[str, ...] = ()
+    block_reason: str | None = "dependency"
+
+
+@dataclass(frozen=True)
+class _Traffic:
+    blocked: tuple = ()
+    needs_controller: tuple = ()
+    inventory_complete: bool = True
+    fetch_error: str | None = None
+
+
+@dataclass(frozen=True)
+class _Stale:
+    daemon_head: str | None
+    checkout_head: str | None
+    remote_head: str | None
+    stale: bool
+    determinable: bool
+    mutation_safe: bool
+
+
+@dataclass(frozen=True)
+class _Health:
+    stale_runtime: _Stale | None
+
+
+class TestProviderConnections(unittest.TestCase):
+    def test_available_provider_status(self):
+        conn = build_provider_connection(_provider(available=True), (_worker(),))
+        self.assertEqual(conn.connection_status, CONNECTION_DECLARED_AVAILABLE)
+        self.assertTrue(conn.available_declared)
+        self.assertEqual(conn.worker_count, 1)
+        self.assertEqual(conn.enabled_worker_count, 1)
+        self.assertFalse(conn.to_dict()["secrets_exposed"])
+
+    def test_unavailable_provider_status(self):
+        conn = build_provider_connection(_provider(available=False), ())
+        self.assertEqual(conn.connection_status, CONNECTION_DECLARED_UNAVAILABLE)
+        self.assertEqual(conn.worker_count, 0)
+
+    def test_notes_are_redacted(self):
+        conn = build_provider_connection(
+            _provider(notes="token=ghp_thisisnotarealsecretvalue0001"),
+            (),
+        )
+        self.assertNotIn("ghp_thisisnotarealsecretvalue0001", conn.notes)
+        self.assertNotIn(
+            "ghp_thisisnotarealsecretvalue0001",
+            json.dumps(conn.to_dict()),
+        )
+
+    def test_load_provider_snapshot_from_injected_registry(self):
+        from webui.worker_registry import WorkerRegistry
+        from pathlib import Path
+
+        registry = WorkerRegistry(
+            version=1,
+            revision=3,
+            updated_at="2026-07-25T00:00:00Z",
+            providers=(_provider("claude"), _provider("grok", available=False)),
+            workers=(_worker(),),
+            source_path=Path("/tmp/workers.registry.json"),
+        )
+        snapshot = load_provider_snapshot(registry=registry)
+        self.assertTrue(snapshot.ok)
+        self.assertEqual(snapshot.registry_revision, 3)
+        ids = {p.provider_id for p in snapshot.providers}
+        self.assertEqual(ids, {"claude", "grok"})
+
+    def test_registry_failure_is_fail_closed(self):
+        def _boom():
+            raise RuntimeError("disk gone")
+
+        snapshot = load_provider_snapshot(registry_loader=_boom)
+        self.assertFalse(snapshot.ok)
+        self.assertIn("unavailable", snapshot.fetch_error or "")
+        self.assertEqual(snapshot.providers, ())
+
+
+class TestInsightGenerators(unittest.TestCase):
+    def test_blocked_queue_requires_evidence(self):
+        traffic = _Traffic(
+            blocked=(
+                _TrafficItem(kind="issue", number=647, block_reason="depends #646"),
+                _TrafficItem(kind="pr", number=902, block_reason="conflict"),
+            )
+        )
+        insight = insight_blocked_queue(traffic)
+        self.assertIsNotNone(insight)
+        self.assertEqual(insight.kind, INSIGHT_BLOCKED_QUEUE)
+        self.assertGreaterEqual(len(insight.evidence), 2)
+        self.assertTrue(insight.advisory_only)
+        self.assertFalse(insight.claims_action_completed)
+        refs = {e.ref for e in insight.evidence}
+        self.assertIn("#647", refs)
+        self.assertIn("#902", refs)
+
+    def test_empty_blocked_queue_yields_no_insight(self):
+        self.assertIsNone(insight_blocked_queue(_Traffic()))
+
+    def test_controller_attention_insight(self):
+        traffic = _Traffic(
+            needs_controller=(_TrafficItem(kind="issue", number=100, traffic_state="needs_controller"),)
+        )
+        insight = insight_controller_attention(traffic)
+        self.assertEqual(insight.kind, INSIGHT_CONTROLLER_ATTENTION)
+        self.assertEqual(insight.evidence[0].ref, "#100")
+
+    def test_stale_runtime_insight(self):
+        health = _Health(
+            stale_runtime=_Stale(
+                daemon_head="aaa",
+                checkout_head="bbb",
+                remote_head="ccc",
+                stale=True,
+                determinable=True,
+                mutation_safe=False,
+            )
+        )
+        insight = insight_stale_runtime(health)
+        self.assertEqual(insight.kind, INSIGHT_STALE_RUNTIME)
+        self.assertIn("stale", insight.evidence[0].detail)
+        self.assertFalse(insight.claims_action_completed)
+
+    def test_mutation_safe_runtime_yields_no_insight(self):
+        health = _Health(
+            stale_runtime=_Stale(
+                daemon_head="aaa",
+                checkout_head="aaa",
+                remote_head="aaa",
+                stale=False,
+                determinable=True,
+                mutation_safe=True,
+            )
+        )
+        self.assertIsNone(insight_stale_runtime(health))
+
+    def test_provider_without_workers(self):
+        providers = (
+            build_provider_connection(_provider("claude"), (_worker(),)),
+            build_provider_connection(_provider("grok"), ()),
+        )
+        insight = insight_providers_without_workers(providers)
+        self.assertEqual(insight.kind, INSIGHT_PROVIDER_WITHOUT_WORKERS)
+        self.assertEqual(insight.evidence[0].ref, "grok")
+
+    def test_generate_insights_composes_three_kinds(self):
+        from webui.worker_registry import WorkerRegistry
+        from pathlib import Path
+
+        registry = WorkerRegistry(
+            version=1,
+            revision=1,
+            updated_at="2026-07-25T00:00:00Z",
+            providers=(_provider("lonely"),),
+            workers=(),
+            source_path=Path("/tmp/w.json"),
+        )
+        provider_snapshot = load_provider_snapshot(registry=registry)
+        traffic = _Traffic(
+            blocked=(_TrafficItem(kind="issue", number=1),),
+            needs_controller=(_TrafficItem(kind="issue", number=2),),
+        )
+        health = _Health(
+            stale_runtime=_Stale("a", "b", "c", True, True, False)
+        )
+        insights, used, unavailable = generate_insights(
+            traffic=traffic,
+            health=health,
+            provider_snapshot=provider_snapshot,
+            analytics=None,
+        )
+        kinds = {i.kind for i in insights}
+        self.assertIn(INSIGHT_BLOCKED_QUEUE, kinds)
+        self.assertIn(INSIGHT_CONTROLLER_ATTENTION, kinds)
+        self.assertIn(INSIGHT_STALE_RUNTIME, kinds)
+        self.assertIn(INSIGHT_PROVIDER_WITHOUT_WORKERS, kinds)
+        self.assertGreaterEqual(len(kinds), 3)
+        self.assertIn("traffic", used)
+        self.assertIn("system_health", used)
+        self.assertIn("providers", used)
+        self.assertTrue(any(u["source"] == "analytics" for u in unavailable))
+        for insight in insights:
+            self.assertTrue(insight.advisory_only)
+            self.assertFalse(insight.claims_action_completed)
+            self.assertGreaterEqual(len(insight.evidence), 1)
+
+    def test_missing_source_is_reported_not_as_healthy_empty(self):
+        insights, used, unavailable = generate_insights(
+            traffic=None,
+            health=None,
+            provider_snapshot=None,
+            analytics=None,
+        )
+        self.assertEqual(insights, ())
+        self.assertEqual(used, ())
+        self.assertEqual(len(unavailable), 4)
+
+
+class TestViewsAndRoutes(unittest.TestCase):
+    def test_providers_page_renders_connections(self):
+        from webui.worker_registry import WorkerRegistry
+        from pathlib import Path
+
+        registry = WorkerRegistry(
+            version=1,
+            revision=1,
+            updated_at="2026-07-25T00:00:00Z",
+            providers=(_provider("claude"),),
+            workers=(_worker(),),
+            source_path=Path("/tmp/w.json"),
+        )
+        snapshot = load_provider_snapshot(registry=registry)
+        html = render_providers_page(snapshot)
+        self.assertIn("AI provider connections", html)
+        self.assertIn("claude", html)
+        self.assertIn("declared_available", html)
+        self.assertIn("Interpretation limits", html)
+        self.assertNotIn("api_key", html.lower())
+
+    def test_failed_provider_snapshot_renders_no_table(self):
+        snapshot = load_provider_snapshot(registry_loader=lambda: (_ for _ in ()).throw(RuntimeError("x")))
+        html = render_providers_page(snapshot)
+        self.assertIn("unavailable", html.lower())
+        self.assertNotIn("<tbody><tr><td><code>", html)
+
+    def test_insights_page_lists_evidence(self):
+        traffic = _Traffic(blocked=(_TrafficItem(kind="issue", number=42),))
+        snapshot = load_insights_snapshot(
+            traffic=traffic,
+            health=_Health(None),
+            provider_snapshot=load_provider_snapshot(
+                registry_loader=lambda: (_ for _ in ()).throw(RuntimeError("skip"))
+            ),
+            analytics=None,
+            load_live=False,
+        )
+        html = render_insights_page(snapshot)
+        self.assertIn("#42", html)
+        self.assertIn("advisory only", html.lower())
+        self.assertIn("Evidence", html)
+
+    def test_nav_exposes_live_insights_and_providers(self):
+        self.assertIn("/insights", nav_hrefs())
+        self.assertIn("/providers", nav_hrefs())
+        self.assertNotIn("/insights", STUB_PAGES)
+
+    def test_routes_are_read_only_and_export_json(self):
+        client = TestClient(create_app())
+        # Use live registry from package data — should be ok.
+        with mock.patch(
+            "webui.app.load_provider_snapshot",
+            return_value=load_provider_snapshot(
+                registry=__import__(
+                    "webui.worker_registry", fromlist=["load_registry"]
+                ).load_registry()
+            ),
+        ):
+            response = client.get("/providers")
+            self.assertEqual(response.status_code, 200)
+            self.assertIn("provider", response.text.lower())
+            api = client.get("/api/v1/providers")
+            self.assertEqual(api.status_code, 200)
+            payload = api.json()
+            self.assertTrue(payload["ok"])
+            self.assertIn("interpretation_limits", payload)
+            self.assertTrue(all(not p.get("secrets_exposed") for p in payload["providers"]))
+
+        with mock.patch(
+            "webui.app.load_insights_snapshot",
+            return_value=load_insights_snapshot(
+                traffic=_Traffic(blocked=(_TrafficItem(kind="issue", number=7),)),
+                health=_Health(None),
+                provider_snapshot=load_provider_snapshot(
+                    registry_loader=lambda: (_ for _ in ()).throw(RuntimeError("x"))
+                ),
+                analytics=None,
+                load_live=False,
+            ),
+        ):
+            page = client.get("/insights")
+            self.assertEqual(page.status_code, 200)
+            self.assertIn("#7", page.text)
+            api = client.get("/api/v1/insights")
+            self.assertEqual(api.status_code, 200)
+            body = api.json()
+            self.assertTrue(body["ok"])
+            self.assertTrue(all(i["advisory_only"] for i in body["insights"]))
+            self.assertTrue(all(not i["claims_action_completed"] for i in body["insights"]))
+            self.assertTrue(all(i["evidence"] for i in body["insights"]))
+
+        for path in ("/providers", "/api/v1/providers", "/insights", "/api/v1/insights"):
+            with self.subTest(path=path):
+                self.assertEqual(client.post(path).status_code, 405)
+
+    def test_home_nav_links_providers_and_insights(self):
+        home = TestClient(create_app()).get("/").text
+        self.assertIn('href="/providers"', home)
+        self.assertIn('href="/insights"', home)
+
+
+if __name__ == "__main__":
+    unittest.main()

webui/app.py

@@ -53,6 +53,18 @@ from webui.session_loader import (
     snapshot_to_dict as session_view_snapshot_to_dict,
 )
 from webui.session_views import render_sessions_page
+from webui.insights_loader import (
+    load_insights_snapshot,
+    load_provider_snapshot,
+    snapshot_insights_to_dict,
+    snapshot_providers_to_dict,
+)
+from webui.insights_views import render_insights_page, render_providers_page
+from webui.linkage_loader import (
+    load_linkage_snapshot,
+    snapshot_to_dict as linkage_snapshot_to_dict,
+)
+from webui.linkage_views import render_linkage_page
 from webui.inventory import (
     SECTION_NAMES as _INVENTORY_SECTIONS,
     load_inventory_snapshot,
@@ -342,6 +354,67 @@ async def api_sessions(_request: Request) -> JSONResponse:
     return JSONResponse(session_view_snapshot_to_dict(load_session_view_snapshot()))
 
 
+async def providers(_request: Request) -> HTMLResponse:
+    """AI-provider connection status (#650) — declared registry only, no secrets."""
+    return HTMLResponse(render_providers_page(load_provider_snapshot()))
+
+
+async def api_v1_providers(_request: Request) -> JSONResponse:
+    """JSON export of declared AI-provider connections (#650)."""
+    snapshot = load_provider_snapshot()
+    return JSONResponse(
+        snapshot_providers_to_dict(snapshot),
+        status_code=200 if snapshot.ok else 502,
+    )
+
+
+async def insights(_request: Request) -> HTMLResponse:
+    """Evidence-backed operational insights (#650) — advisory only."""
+    return HTMLResponse(render_insights_page(load_insights_snapshot()))
+
+
+async def api_v1_insights(_request: Request) -> JSONResponse:
+    """JSON export of evidence-backed insights (#650)."""
+    snapshot = load_insights_snapshot()
+    return JSONResponse(
+        snapshot_insights_to_dict(snapshot),
+        status_code=200 if snapshot.ok else 502,
+    )
+
+
+def _linkage_snapshot(request: Request):
+    """Load one linkage snapshot from the request's scope and focus parameters."""
+    return load_linkage_snapshot(
+        request.query_params.get("project") or None,
+        state=request.query_params.get("state"),
+        issue=_query_int(request, "issue"),
+        pr=_query_int(request, "pr"),
+    )
+
+
+async def gitea_linkage(request: Request) -> HTMLResponse:
+    """Gitea issue↔PR linkage console (#645) — read-only.
+
+    Always 200, including on a failed read: this is an operator view, and it
+    must render *why* linkage could not be loaded rather than withhold the page.
+    The snapshot itself carries ``ok=False`` and the page refuses to draw a
+    linkage table it cannot stand behind.
+    """
+    return HTMLResponse(render_linkage_page(_linkage_snapshot(request)))
+
+
+async def api_v1_gitea_linkage(request: Request) -> JSONResponse:
+    """JSON export of the issue↔PR linkage model (#645).
+
+    Unlike the HTML view, the API answers with 502 when the snapshot could not
+    be loaded, so an automated consumer cannot read a fail-closed payload as a
+    successful "no links exist" result.
+    """
+    snapshot = _linkage_snapshot(request)
+    return JSONResponse(
+        linkage_snapshot_to_dict(snapshot),
+        status_code=200 if snapshot.ok else 502,
+    )
 async def _parse_audit_form(request: Request) -> tuple[str, str | None]:
     if request.method == "GET":
         return "", None
@@ -785,6 +858,12 @@ def create_app(*, bind_host: str | None = None) -> Starlette:
             Route("/api/sessions", api_sessions, methods=["GET"]),
             Route("/api/v1/sessions", api_sessions, methods=["GET"]),
             Route("/api/v1/timeline", api_v1_timeline, methods=["GET"]),
+            Route("/providers", providers, methods=["GET"]),
+            Route("/api/v1/providers", api_v1_providers, methods=["GET"]),
+            Route("/insights", insights, methods=["GET"]),
+            Route("/api/v1/insights", api_v1_insights, methods=["GET"]),
+            Route("/gitea", gitea_linkage, methods=["GET"]),
+            Route("/api/v1/gitea/linkage", api_v1_gitea_linkage, methods=["GET"]),
             Route("/analytics", analytics, methods=["GET"]),
             Route("/api/analytics", api_v1_analytics, methods=["GET"]),
             Route("/api/v1/analytics", api_v1_analytics, methods=["GET"]),

webui/insights_loader.py

@@ -0,0 +1,713 @@
+"""AI-provider connections and evidence-backed operational insights (#650, Phase 4).
+
+Operators need two related, **advisory** surfaces:
+
+1. **Provider connection status** — which AI runtimes are *declared* in the
+   worker registry (#798), without ever exposing API keys or inventing a live
+   probe that this process cannot perform.
+2. **Evidence-backed insights** — short cards derived only from durable
+   console evidence (traffic, system health, analytics, the same registry).
+   Every insight carries explicit evidence refs (issue/PR/provider/event ids).
+   Insights never claim that a workflow action completed without proof, and
+   they never mutate anything.
+
+Design rules matching the rest of the console:
+
+- **Read-only.** No endpoint registered here mutates Gitea, the control plane,
+  or the registry.
+- **Advisory only.** Insights carry ``advisory_only=True`` and never emit an
+  "action completed" claim. The allocator, review, and merge paths remain the
+  only authorities for work selection and terminal state.
+- **Qualified absence.** When a source could not run, the insight list says so
+  rather than inventing an empty-and-healthy fleet or zero blocked items.
+- **Redaction.** Free-text titles, reasons, and notes pass through
+  ``webui.console_redaction`` before they leave this module.
+- **No secrets.** Provider records are taken from the credential-free worker
+  registry. Keys never appear in this surface.
+
+Non-goals (from the issue): free-form chatbot that overrides gates, secret
+provider keys in the UI, auto-merge or auto-close from insights.
+"""
+
+from __future__ import annotations
+
+import os
+from dataclasses import dataclass
+from typing import Any, Callable, Sequence
+
+from webui import console_redaction
+from webui.worker_registry import (
+    ProviderRecord,
+    WorkerRegistry,
+    WorkerRecord,
+    load_registry as load_worker_registry,
+    workers_for_provider,
+)
+
+INSIGHTS_SCHEMA_VERSION = 1
+
+# Provider connection vocabulary. Declared availability is not a live probe —
+# the worker registry owns the declaration, and adapters (#800) own live checks.
+CONNECTION_DECLARED_AVAILABLE = "declared_available"
+CONNECTION_DECLARED_UNAVAILABLE = "declared_unavailable"
+CONNECTION_REGISTRY_UNAVAILABLE = "registry_unavailable"
+
+# Insight kinds. Each generator is a pure function over one evidence source.
+INSIGHT_BLOCKED_QUEUE = "blocked_queue_pressure"
+INSIGHT_CONTROLLER_ATTENTION = "controller_attention"
+INSIGHT_STALE_RUNTIME = "stale_runtime_risk"
+INSIGHT_PROVIDER_WITHOUT_WORKERS = "provider_without_workers"
+INSIGHT_ANALYTICS_FAILURE_RATE = "analytics_failure_pressure"
+
+SEVERITY_INFO = "info"
+SEVERITY_WARN = "warn"
+SEVERITY_CRITICAL = "critical"
+SEVERITY_UNPROVEN = "unproven"
+
+CONFIDENCE_HIGH = "high"
+CONFIDENCE_MEDIUM = "medium"
+CONFIDENCE_LOW = "low"
+CONFIDENCE_UNPROVEN = "unproven"
+
+
+def _redact(value: Any) -> Any:
+    if value is None:
+        return None
+    return console_redaction.redact_text(str(value))
+
+
+def _offline_test_mode() -> bool:
+    return (os.environ.get("WEBUI_TEST_OFFLINE") or "").strip().lower() in {
+        "1",
+        "true",
+        "yes",
+        "on",
+    }
+
+
+# --- Provider connection status ------------------------------------------------
+
+
+@dataclass(frozen=True)
+class ProviderConnection:
+    """One AI provider's declared connection status (no secrets, no live probe)."""
+
+    provider_id: str
+    display_name: str
+    vendor: str
+    executable: str
+    connection_status: str
+    available_declared: bool
+    models: tuple[str, ...]
+    worker_count: int
+    enabled_worker_count: int
+    notes: str
+    #: Explicit statement of what was *not* proven (live process health, etc.).
+    probe_limit: str
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "provider_id": self.provider_id,
+            "display_name": self.display_name,
+            "vendor": self.vendor,
+            "executable": self.executable,
+            "connection_status": self.connection_status,
+            "available_declared": self.available_declared,
+            "models": list(self.models),
+            "worker_count": self.worker_count,
+            "enabled_worker_count": self.enabled_worker_count,
+            "notes": self.notes,
+            "probe_limit": self.probe_limit,
+            # Always true for this surface: keys are never loaded.
+            "secrets_exposed": False,
+        }
+
+
+@dataclass(frozen=True)
+class ProviderSnapshot:
+    ok: bool
+    providers: tuple[ProviderConnection, ...] = ()
+    registry_revision: int | None = None
+    registry_path: str | None = None
+    fetch_error: str | None = None
+    schema_version: int = INSIGHTS_SCHEMA_VERSION
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "ok": self.ok,
+            "schema_version": self.schema_version,
+            "registry_revision": self.registry_revision,
+            "registry_path": self.registry_path,
+            "fetch_error": self.fetch_error,
+            "providers": [p.to_dict() for p in self.providers],
+            "interpretation_limits": [
+                "connection_status reflects the worker registry declaration only",
+                "no API keys or credential material are loaded or rendered",
+                "live executable health is not probed on this surface (#800 owns that)",
+            ],
+        }
+
+
+_PROBE_LIMIT = (
+    "Declared status only. This console does not probe the provider executable "
+    "or call vendor APIs; live health belongs to the provider adapter framework."
+)
+
+
+def connection_status_for(provider: ProviderRecord) -> str:
+    return (
+        CONNECTION_DECLARED_AVAILABLE
+        if provider.available
+        else CONNECTION_DECLARED_UNAVAILABLE
+    )
+
+
+def build_provider_connection(
+    provider: ProviderRecord,
+    workers: Sequence[WorkerRecord],
+) -> ProviderConnection:
+    enabled = sum(1 for worker in workers if worker.enabled)
+    return ProviderConnection(
+        provider_id=provider.id,
+        display_name=str(_redact(provider.display_name) or provider.id),
+        vendor=str(_redact(provider.vendor) or ""),
+        executable=str(_redact(provider.executable) or ""),
+        connection_status=connection_status_for(provider),
+        available_declared=bool(provider.available),
+        models=tuple(str(_redact(m) or m) for m in provider.models),
+        worker_count=len(workers),
+        enabled_worker_count=enabled,
+        notes=str(_redact(provider.notes) or ""),
+        probe_limit=_PROBE_LIMIT,
+    )
+
+
+def load_provider_snapshot(
+    *,
+    registry: WorkerRegistry | None = None,
+    registry_loader: Callable[[], WorkerRegistry] | None = None,
+) -> ProviderSnapshot:
+    """Load declared provider connections. Never raises for missing registry."""
+    if registry is None:
+        loader = registry_loader or load_worker_registry
+        try:
+            if _offline_test_mode() and registry_loader is None:
+                return ProviderSnapshot(
+                    ok=False,
+                    fetch_error=(
+                        "provider registry not loaded in offline test mode "
+                        "(inject a registry for unit tests)"
+                    ),
+                )
+            registry = loader()
+        except Exception as exc:  # fail soft — operator-visible reason
+            return ProviderSnapshot(
+                ok=False,
+                fetch_error=str(_redact(f"worker registry unavailable: {exc}")),
+            )
+
+    connections = tuple(
+        build_provider_connection(provider, workers_for_provider(registry, provider.id))
+        for provider in registry.providers
+    )
+    return ProviderSnapshot(
+        ok=True,
+        providers=connections,
+        registry_revision=registry.revision,
+        registry_path=str(registry.source_path),
+    )
+
+
+# --- Evidence-backed insights --------------------------------------------------
+
+
+@dataclass(frozen=True)
+class EvidenceRef:
+    """One durable reference an insight is allowed to cite."""
+
+    kind: str  # issue | pr | provider | health | analytics | traffic
+    ref: str
+    detail: str
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "kind": self.kind,
+            "ref": self.ref,
+            "detail": str(_redact(self.detail) or ""),
+        }
+
+
+@dataclass(frozen=True)
+class Insight:
+    """One advisory finding. Never a claim that an action completed."""
+
+    insight_id: str
+    kind: str
+    severity: str
+    confidence: str
+    title: str
+    summary: str
+    evidence: tuple[EvidenceRef, ...]
+    advisory_only: bool = True
+    claims_action_completed: bool = False
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "insight_id": self.insight_id,
+            "kind": self.kind,
+            "severity": self.severity,
+            "confidence": self.confidence,
+            "title": str(_redact(self.title) or ""),
+            "summary": str(_redact(self.summary) or ""),
+            "evidence": [item.to_dict() for item in self.evidence],
+            "advisory_only": self.advisory_only,
+            "claims_action_completed": self.claims_action_completed,
+        }
+
+
+@dataclass(frozen=True)
+class InsightsSnapshot:
+    ok: bool
+    insights: tuple[Insight, ...] = ()
+    sources_used: tuple[str, ...] = ()
+    sources_unavailable: tuple[dict[str, str], ...] = ()
+    fetch_error: str | None = None
+    schema_version: int = INSIGHTS_SCHEMA_VERSION
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "ok": self.ok,
+            "schema_version": self.schema_version,
+            "insights": [insight.to_dict() for insight in self.insights],
+            "sources_used": list(self.sources_used),
+            "sources_unavailable": list(self.sources_unavailable),
+            "fetch_error": self.fetch_error,
+            "interpretation_limits": [
+                "insights are advisory only and never authorize merge, review, or close",
+                "an insight without evidence refs is refused rather than emitted",
+                "a missing source is listed under sources_unavailable, not as an empty success",
+                "insights never claim a workflow action completed",
+            ],
+        }
+
+
+def _require_evidence(evidence: Sequence[EvidenceRef]) -> tuple[EvidenceRef, ...]:
+    """Fail closed: an insight with no evidence must not be emitted."""
+    items = tuple(evidence)
+    if not items:
+        raise ValueError("insight requires at least one evidence ref")
+    return items
+
+
+def insight_blocked_queue(traffic: Any) -> Insight | None:
+    """Traffic blocked bucket pressure with per-item evidence."""
+    blocked = tuple(getattr(traffic, "blocked", ()) or ())
+    if not blocked:
+        return None
+    evidence = []
+    for item in blocked[:20]:
+        kind = str(getattr(item, "kind", "issue") or "issue")
+        number = int(getattr(item, "number", 0) or 0)
+        if number <= 0:
+            continue
+        reason = getattr(item, "block_reason", None) or "blocked"
+        evidence.append(
+            EvidenceRef(
+                kind=kind,
+                ref=f"#{number}",
+                detail=f"traffic_state=blocked; reason={reason}",
+            )
+        )
+    if not evidence:
+        return None
+    count = len(blocked)
+    severity = SEVERITY_CRITICAL if count >= 10 else SEVERITY_WARN
+    return Insight(
+        insight_id=f"{INSIGHT_BLOCKED_QUEUE}:{count}",
+        kind=INSIGHT_BLOCKED_QUEUE,
+        severity=severity,
+        confidence=(
+            CONFIDENCE_HIGH
+            if getattr(traffic, "inventory_complete", False)
+            else CONFIDENCE_MEDIUM
+        ),
+        title=f"{count} blocked work item(s) in traffic control",
+        summary=(
+            f"Traffic control reports {count} blocked item(s). "
+            "This is an observation of the loaded window, not a claim that "
+            "any remediation ran."
+        ),
+        evidence=_require_evidence(evidence),
+    )
+
+
+def insight_controller_attention(traffic: Any) -> Insight | None:
+    needs = tuple(getattr(traffic, "needs_controller", ()) or ())
+    if not needs:
+        return None
+    evidence = []
+    for item in needs[:20]:
+        kind = str(getattr(item, "kind", "issue") or "issue")
+        number = int(getattr(item, "number", 0) or 0)
+        if number <= 0:
+            continue
+        evidence.append(
+            EvidenceRef(
+                kind=kind,
+                ref=f"#{number}",
+                detail="traffic_state=needs_controller",
+            )
+        )
+    if not evidence:
+        return None
+    count = len(needs)
+    return Insight(
+        insight_id=f"{INSIGHT_CONTROLLER_ATTENTION}:{count}",
+        kind=INSIGHT_CONTROLLER_ATTENTION,
+        severity=SEVERITY_WARN if count else SEVERITY_INFO,
+        confidence=(
+            CONFIDENCE_HIGH
+            if getattr(traffic, "inventory_complete", False)
+            else CONFIDENCE_MEDIUM
+        ),
+        title=f"{count} item(s) need controller attention",
+        summary=(
+            f"Traffic control marks {count} item(s) as needs_controller. "
+            "Advisory only — the controller allocator remains the authority "
+            "for routing."
+        ),
+        evidence=_require_evidence(evidence),
+    )
+
+
+def insight_stale_runtime(health: Any) -> Insight | None:
+    stale = getattr(health, "stale_runtime", None)
+    if stale is None:
+        return None
+    mutation_safe = bool(getattr(stale, "mutation_safe", False))
+    is_stale = bool(getattr(stale, "stale", False))
+    determinable = bool(getattr(stale, "determinable", False))
+    if mutation_safe and not is_stale:
+        return None
+    daemon = getattr(stale, "daemon_head", None) or "unknown"
+    checkout = getattr(stale, "checkout_head", None) or "unknown"
+    remote = getattr(stale, "remote_head", None) or "unknown"
+    if not determinable:
+        severity = SEVERITY_UNPROVEN
+        confidence = CONFIDENCE_UNPROVEN
+        title = "Runtime parity is not determinable"
+        summary = (
+            "System health could not prove mutation_safe. This is not proof "
+            "that the runtime is stale — only that parity was unproven."
+        )
+    else:
+        severity = SEVERITY_CRITICAL if is_stale else SEVERITY_WARN
+        confidence = CONFIDENCE_HIGH
+        title = "Stale or mutation-unsafe runtime"
+        summary = (
+            "System health reports a runtime that is not mutation_safe. "
+            "No restart or recovery is claimed by this insight."
+        )
+    return Insight(
+        insight_id=f"{INSIGHT_STALE_RUNTIME}:{daemon}:{checkout}",
+        kind=INSIGHT_STALE_RUNTIME,
+        severity=severity,
+        confidence=confidence,
+        title=title,
+        summary=summary,
+        evidence=_require_evidence(
+            (
+                EvidenceRef(
+                    kind="health",
+                    ref="stale_runtime",
+                    detail=(
+                        f"stale={is_stale}; mutation_safe={mutation_safe}; "
+                        f"determinable={determinable}; daemon={daemon}; "
+                        f"checkout={checkout}; remote={remote}"
+                    ),
+                ),
+            )
+        ),
+    )
+
+
+def insight_providers_without_workers(
+    providers: Sequence[ProviderConnection],
+) -> Insight | None:
+    lonely = [
+        provider
+        for provider in providers
+        if provider.available_declared and provider.worker_count == 0
+    ]
+    if not lonely:
+        return None
+    evidence = tuple(
+        EvidenceRef(
+            kind="provider",
+            ref=provider.provider_id,
+            detail=(
+                f"available_declared=true; worker_count=0; "
+                f"vendor={provider.vendor}"
+            ),
+        )
+        for provider in lonely
+    )
+    return Insight(
+        insight_id=f"{INSIGHT_PROVIDER_WITHOUT_WORKERS}:{len(lonely)}",
+        kind=INSIGHT_PROVIDER_WITHOUT_WORKERS,
+        severity=SEVERITY_INFO,
+        confidence=CONFIDENCE_HIGH,
+        title=f"{len(lonely)} declared-available provider(s) have no workers",
+        summary=(
+            "The worker registry declares these providers available but no "
+            "worker instance names them. This is a configuration observation, "
+            "not a claim that a provider process is running or idle."
+        ),
+        evidence=_require_evidence(evidence),
+    )
+
+
+def insight_analytics_failures(analytics: Any) -> Insight | None:
+    """Flag elevated non-ok stage status in analytics when events exist."""
+    if analytics is None or not getattr(analytics, "ok", False):
+        return None
+    events = tuple(getattr(analytics, "events", ()) or ())
+    if not events:
+        return None
+    failed = [
+        event
+        for event in events
+        if str(getattr(event, "status", "") or "").lower()
+        in {"error", "failed", "failure"}
+    ]
+    if not failed:
+        return None
+    # Cap evidence so a large window stays readable.
+    evidence = []
+    for event in failed[:20]:
+        usage_id = getattr(event, "usage_id", None)
+        issue = getattr(event, "issue_number", None)
+        pr = getattr(event, "pr_number", None)
+        if pr is not None:
+            ref_kind, ref = "pr", f"#{int(pr)}"
+        elif issue is not None:
+            ref_kind, ref = "issue", f"#{int(issue)}"
+        else:
+            ref_kind, ref = "analytics", f"usage:{usage_id}"
+        evidence.append(
+            EvidenceRef(
+                kind=ref_kind,
+                ref=ref,
+                detail=(
+                    f"status={getattr(event, 'status', '')}; "
+                    f"stage={getattr(event, 'stage', '')}; "
+                    f"model={getattr(event, 'model', '')}"
+                ),
+            )
+        )
+    if not evidence:
+        return None
+    rate = len(failed) / max(len(events), 1)
+    return Insight(
+        insight_id=f"{INSIGHT_ANALYTICS_FAILURE_RATE}:{len(failed)}:{len(events)}",
+        kind=INSIGHT_ANALYTICS_FAILURE_RATE,
+        severity=SEVERITY_WARN if rate >= 0.1 else SEVERITY_INFO,
+        confidence=CONFIDENCE_MEDIUM,
+        title=f"{len(failed)} analytics event(s) reported failure status",
+        summary=(
+            f"{len(failed)} of {len(events)} loaded analytics events carry a "
+            "failure status. Advisory only — this is not a gate decision."
+        ),
+        evidence=_require_evidence(evidence),
+    )
+
+
+def generate_insights(
+    *,
+    traffic: Any | None = None,
+    health: Any | None = None,
+    provider_snapshot: ProviderSnapshot | None = None,
+    analytics: Any | None = None,
+) -> tuple[tuple[Insight, ...], tuple[str, ...], tuple[dict[str, str], ...]]:
+    """Pure multi-source insight generation. Never mutates inputs."""
+    insights: list[Insight] = []
+    used: list[str] = []
+    unavailable: list[dict[str, str]] = []
+
+    if traffic is None:
+        unavailable.append(
+            {"source": "traffic", "reason": "traffic snapshot not supplied"}
+        )
+    elif getattr(traffic, "fetch_error", None):
+        unavailable.append(
+            {
+                "source": "traffic",
+                "reason": str(_redact(traffic.fetch_error) or "traffic fetch failed"),
+            }
+        )
+    else:
+        used.append("traffic")
+        for builder in (insight_blocked_queue, insight_controller_attention):
+            try:
+                item = builder(traffic)
+            except ValueError:
+                continue
+            if item is not None:
+                insights.append(item)
+
+    if health is None:
+        unavailable.append(
+            {"source": "system_health", "reason": "system health snapshot not supplied"}
+        )
+    else:
+        used.append("system_health")
+        try:
+            item = insight_stale_runtime(health)
+        except ValueError:
+            item = None
+        if item is not None:
+            insights.append(item)
+
+    if provider_snapshot is None:
+        unavailable.append(
+            {"source": "providers", "reason": "provider snapshot not supplied"}
+        )
+    elif not provider_snapshot.ok:
+        unavailable.append(
+            {
+                "source": "providers",
+                "reason": str(
+                    _redact(provider_snapshot.fetch_error)
+                    or "provider registry unavailable"
+                ),
+            }
+        )
+    else:
+        used.append("providers")
+        try:
+            item = insight_providers_without_workers(provider_snapshot.providers)
+        except ValueError:
+            item = None
+        if item is not None:
+            insights.append(item)
+
+    if analytics is None:
+        unavailable.append(
+            {"source": "analytics", "reason": "analytics snapshot not supplied"}
+        )
+    elif not getattr(analytics, "ok", False):
+        unavailable.append(
+            {
+                "source": "analytics",
+                "reason": str(
+                    _redact(getattr(analytics, "fetch_error", None))
+                    or "analytics snapshot not ok"
+                ),
+            }
+        )
+    else:
+        used.append("analytics")
+        try:
+            item = insight_analytics_failures(analytics)
+        except ValueError:
+            item = None
+        if item is not None:
+            insights.append(item)
+
+    # Stable ordering: severity then kind.
+    _sev_rank = {
+        SEVERITY_CRITICAL: 0,
+        SEVERITY_WARN: 1,
+        SEVERITY_INFO: 2,
+        SEVERITY_UNPROVEN: 3,
+    }
+    insights.sort(key=lambda i: (_sev_rank.get(i.severity, 9), i.kind, i.insight_id))
+    return tuple(insights), tuple(used), tuple(unavailable)
+
+
+def load_insights_snapshot(
+    *,
+    traffic: Any | None = None,
+    health: Any | None = None,
+    provider_snapshot: ProviderSnapshot | None = None,
+    analytics: Any | None = None,
+    load_live: bool = True,
+) -> InsightsSnapshot:
+    """Compose insights from injected or live console evidence sources."""
+    sources_unavailable: list[dict[str, str]] = []
+
+    if load_live and traffic is None and not _offline_test_mode():
+        try:
+            from webui.traffic_loader import load_traffic_snapshot
+
+            traffic = load_traffic_snapshot()
+        except Exception as exc:  # fail soft
+            sources_unavailable.append(
+                {
+                    "source": "traffic",
+                    "reason": str(_redact(f"traffic load failed: {exc}")),
+                }
+            )
+            traffic = None
+
+    if load_live and health is None and not _offline_test_mode():
+        try:
+            from webui.system_health import load_system_health
+
+            health = load_system_health()
+        except Exception as exc:
+            sources_unavailable.append(
+                {
+                    "source": "system_health",
+                    "reason": str(_redact(f"system health load failed: {exc}")),
+                }
+            )
+            health = None
+
+    if provider_snapshot is None:
+        provider_snapshot = load_provider_snapshot()
+
+    if load_live and analytics is None and not _offline_test_mode():
+        try:
+            from webui.analytics_loader import load_analytics
+
+            analytics = load_analytics()
+        except Exception as exc:
+            sources_unavailable.append(
+                {
+                    "source": "analytics",
+                    "reason": str(_redact(f"analytics load failed: {exc}")),
+                }
+            )
+            analytics = None
+
+    insights, used, unavailable = generate_insights(
+        traffic=traffic,
+        health=health,
+        provider_snapshot=provider_snapshot,
+        analytics=analytics,
+    )
+    merged_unavailable = tuple(sources_unavailable) + unavailable
+    # ok when at least one source contributed or we can honestly report absence.
+    ok = bool(used) or bool(merged_unavailable)
+    return InsightsSnapshot(
+        ok=ok,
+        insights=insights,
+        sources_used=used,
+        sources_unavailable=merged_unavailable,
+        fetch_error=None
+        if used
+        else (
+            "no evidence sources produced a usable snapshot"
+            if merged_unavailable
+            else "no insight sources ran"
+        ),
+    )
+
+
+def snapshot_providers_to_dict(snapshot: ProviderSnapshot) -> dict[str, Any]:
+    return snapshot.to_dict()
+
+
+def snapshot_insights_to_dict(snapshot: InsightsSnapshot) -> dict[str, Any]:
+    return snapshot.to_dict()

webui/insights_views.py

@@ -0,0 +1,196 @@
+"""HTML views for AI-provider connections and operational insights (#650)."""
+
+from __future__ import annotations
+
+from html import escape
+
+from webui.insights_loader import (
+    CONNECTION_DECLARED_AVAILABLE,
+    CONNECTION_DECLARED_UNAVAILABLE,
+    InsightsSnapshot,
+    ProviderSnapshot,
+    SEVERITY_CRITICAL,
+    SEVERITY_INFO,
+    SEVERITY_UNPROVEN,
+    SEVERITY_WARN,
+)
+from webui.layout import render_page
+
+_SEVERITY_CSS = {
+    SEVERITY_CRITICAL: "badge-blocked",
+    SEVERITY_WARN: "badge-health-degraded",
+    SEVERITY_INFO: "badge-health-ok",
+    SEVERITY_UNPROVEN: "badge-health-unproven",
+}
+
+_CONN_CSS = {
+    CONNECTION_DECLARED_AVAILABLE: "badge-health-ok",
+    CONNECTION_DECLARED_UNAVAILABLE: "badge-health-degraded",
+    "registry_unavailable": "badge-blocked",
+}
+
+
+def _badge(text: str, css: str) -> str:
+    return f'<span class="badge {css}">{escape(text)}</span>'
+
+
+def _limits_card(lines: list[str], *, title: str) -> str:
+    items = "".join(f"<li>{escape(line)}</li>" for line in lines)
+    return f"""<div class="prompt-card">
+  <h3>{escape(title)}</h3>
+  <ul class="reasons">{items}</ul>
+  <p class="muted">Advisory surface only — no review, merge, close, or provider
+  mutation is available here.</p>
+</div>"""
+
+
+def render_providers_page(snapshot: ProviderSnapshot) -> str:
+    """Render the AI-provider connections page."""
+    if not snapshot.ok:
+        body = f"""<h2>AI provider connections</h2>
+<p class="meta">Phase 4 read-only provider status (#650).</p>
+<div class="health-card health-stale">
+  <strong>Provider registry unavailable:</strong>
+  {escape(snapshot.fetch_error or "registry could not be loaded")}.
+  No connection table is rendered — an empty table would claim that no
+  providers are configured.
+</div>
+{_limits_card([
+    "connection_status reflects the worker registry declaration only",
+    "no API keys or credential material are loaded or rendered",
+    "live executable health is not probed on this surface",
+], title="Interpretation limits")}
+"""
+        return render_page(title="Providers", body_html=body)
+
+    rows = []
+    for provider in snapshot.providers:
+        models = (
+            ", ".join(f"<code>{escape(m)}</code>" for m in provider.models)
+            if provider.models
+            else '<span class="muted">none declared</span>'
+        )
+        rows.append(
+            "<tr>"
+            f"<td><code>{escape(provider.provider_id)}</code></td>"
+            f"<td>{escape(provider.display_name)}</td>"
+            f"<td>{escape(provider.vendor)}</td>"
+            f"<td><code>{escape(provider.executable)}</code></td>"
+            f"<td>{_badge(provider.connection_status, _CONN_CSS.get(provider.connection_status, 'badge-health-skipped'))}</td>"
+            f"<td>{provider.worker_count} "
+            f"({provider.enabled_worker_count} enabled)</td>"
+            f"<td>{models}</td>"
+            "</tr>"
+        )
+    table = (
+        "".join(rows)
+        if rows
+        else '<tr><td colspan="7" class="muted">No providers declared in the registry.</td></tr>'
+    )
+
+    body = f"""<h2>AI provider connections</h2>
+<p class="meta">Phase 4 read-only provider status (#650). Registry revision
+<code>{escape(str(snapshot.registry_revision))}</code>.
+Declared status only — secrets never load.</p>
+
+<div class="health-card">
+  <h3>Declared connections</h3>
+  <table class="registry">
+    <thead>
+      <tr>
+        <th>Provider</th><th>Name</th><th>Vendor</th><th>Executable</th>
+        <th>Connection</th><th>Workers</th><th>Models (declared)</th>
+      </tr>
+    </thead>
+    <tbody>{table}</tbody>
+  </table>
+  <p class="muted">{escape(snapshot.providers[0].probe_limit if snapshot.providers else "")}</p>
+</div>
+
+{_limits_card([
+    "connection_status reflects the worker registry declaration only",
+    "no API keys or credential material are loaded or rendered",
+    "live executable health is not probed on this surface (#800 owns that)",
+], title="Interpretation limits")}
+<p class="muted">Related: <a href="/insights">Operational insights</a> ·
+<a href="/analytics">Analytics</a></p>
+"""
+    return render_page(title="Providers", body_html=body)
+
+
+def _evidence_list(insight) -> str:
+    items = "".join(
+        f"<li><code>{escape(ref.kind)}:{escape(ref.ref)}</code> — "
+        f"{escape(ref.detail)}</li>"
+        for ref in insight.evidence
+    )
+    return f'<ul class="reasons">{items}</ul>'
+
+
+def render_insights_page(snapshot: InsightsSnapshot) -> str:
+    """Render the operational insights page."""
+    if not snapshot.ok and not snapshot.insights:
+        body = f"""<h2>Operational insights</h2>
+<p class="meta">Phase 4 evidence-backed insights (#650).</p>
+<div class="health-card health-stale">
+  <strong>Insights unavailable:</strong>
+  {escape(snapshot.fetch_error or "no sources ran")}.
+</div>
+{_limits_card([
+    "insights are advisory only and never authorize merge, review, or close",
+    "an insight without evidence refs is refused rather than emitted",
+], title="Interpretation limits")}
+"""
+        return render_page(title="Insights", body_html=body)
+
+    source_bits = []
+    if snapshot.sources_used:
+        source_bits.append(
+            "sources used: " + ", ".join(f"<code>{escape(s)}</code>" for s in snapshot.sources_used)
+        )
+    if snapshot.sources_unavailable:
+        missing = "; ".join(
+            f"{escape(item.get('source', '?'))}: {escape(item.get('reason', ''))}"
+            for item in snapshot.sources_unavailable
+        )
+        source_bits.append(f"sources unavailable: {missing}")
+
+    cards = []
+    for insight in snapshot.insights:
+        cards.append(
+            f"""<div class="prompt-card">
+  <h3>{_badge(insight.severity, _SEVERITY_CSS.get(insight.severity, "badge-health-skipped"))}
+  {escape(insight.title)}</h3>
+  <p class="meta"><code>{escape(insight.kind)}</code> · confidence
+  <code>{escape(insight.confidence)}</code> ·
+  {_badge("advisory only", "badge-health-skipped")} ·
+  {_badge("no action claimed", "badge-health-ok")}</p>
+  <p>{escape(insight.summary)}</p>
+  <h4>Evidence</h4>
+  {_evidence_list(insight)}
+</div>"""
+        )
+    if not cards:
+        cards.append(
+            '<div class="prompt-card"><p class="muted">No insights met the '
+            "evidence threshold in the loaded sources. That is not a claim "
+            "that the fleet is healthy — only that no qualifying pattern was "
+            "found.</p></div>"
+        )
+
+    body = f"""<h2>Operational insights</h2>
+<p class="meta">Phase 4 evidence-backed insights (#650). Derived only from
+durable console evidence; never invents policy or completes workflow actions.</p>
+<p class="muted">{" · ".join(source_bits) if source_bits else ""}</p>
+{"".join(cards)}
+{_limits_card([
+    "insights are advisory only and never authorize merge, review, or close",
+    "an insight without evidence refs is refused rather than emitted",
+    "a missing source is listed as unavailable, not as an empty success",
+    "insights never claim a workflow action completed",
+], title="Interpretation limits")}
+<p class="muted">Related: <a href="/providers">Provider connections</a> ·
+<a href="/traffic">Traffic</a> · <a href="/system-health">System health</a> ·
+<a href="/analytics">Analytics</a></p>
+"""
+    return render_page(title="Insights", body_html=body)

webui/linkage_loader.py

@@ -0,0 +1,771 @@
+"""Gitea issue↔PR linkage model for the console (#645, Phase 3).
+
+Operators lose context between an issue and the PR that closes it: which PR
+carries which issue, whether two PRs claim the same issue, and what the latest
+canonical handoff on that thread said. The evidence exists in Gitea, but only
+as free text scattered across PR titles, bodies, and branch names.
+
+This module resolves that linkage into one read-only model:
+
+* :func:`resolve_linkage` is a pure function from raw Gitea issue/PR payloads to
+  a :class:`LinkageIndex`. It records *how* each edge was found (a ``Closes #N``
+  keyword, the canonical ``feat/issue-N-…`` branch marker, or a bare ``#N``
+  body reference) and never collapses several candidates into one silent guess.
+* :func:`load_linkage_snapshot` scopes that index to a registry project and
+  optionally attaches the latest Canonical Thread Handoff (CTH) summary for one
+  focused issue or PR.
+
+Design rules, matching the rest of the console:
+
+- **Read-only.** Gitea is read through the shared authenticated helpers. No
+  endpoint here mutates anything, and no write action is registered.
+- **Qualified absence.** Linkage is a claim about a *loaded* window of Gitea.
+  When pagination did not complete, when credentials were unavailable, or when
+  only open items were fetched, the snapshot says so and every "no linked PR"
+  is marked non-authoritative. An empty edge list from a partial read is not
+  evidence that no link exists.
+- **Handoff is loaded, never assumed.** CTH comments are thread-scoped, so they
+  are fetched only for an explicitly focused issue or PR. Every other row
+  reports ``not_loaded`` rather than rendering as "no handoff".
+- **Redaction at the boundary.** Titles, labels, handoff fields, and error
+  reasons are free text from Gitea and cross :mod:`webui.console_redaction`
+  before they leave this module.
+- **Deep links are opt-in.** A link to the Gitea web UI is emitted only under
+  the ``GITEA_MCP_REVEAL_ENDPOINTS`` admin opt-in, exactly as the MCP tools
+  gate their own URL exposure.
+
+Non-goals (from the issue): no issue/PR editor, no browser review or merge, no
+reimplementation of Gitea search.
+"""
+
+from __future__ import annotations
+
+import os
+import re
+from dataclasses import dataclass
+from typing import Any, Callable, Iterable, Sequence
+
+from gitea_auth import api_fetch_page, get_auth_header, gitea_url, repo_api_url
+
+from webui import console_redaction
+from webui.project_registry import ProjectRecord, load_registry
+from webui.queue_loader import (
+    PaginationMeta,
+    _fetch_issues,
+    _fetch_prs,
+    _host_from_url,
+)
+
+#: Version of the serialized linkage contract. Bump on any breaking change.
+LINKAGE_SCHEMA_VERSION = 1
+
+# --- Linkage evidence -------------------------------------------------------
+# Ordered strongest to weakest. The strength ordering is what makes an
+# ambiguous PR detectable: two candidates at the same strength are a genuine
+# ambiguity, while a weaker candidate alongside a stronger one is not.
+EVIDENCE_CLOSES = "closes_keyword"
+EVIDENCE_BRANCH = "branch_marker"
+EVIDENCE_REFERENCE = "body_reference"
+
+EVIDENCE_ORDER: tuple[str, ...] = (
+    EVIDENCE_CLOSES,
+    EVIDENCE_BRANCH,
+    EVIDENCE_REFERENCE,
+)
+_EVIDENCE_RANK = {name: rank for rank, name in enumerate(EVIDENCE_ORDER)}
+
+EVIDENCE_DESCRIPTIONS: dict[str, str] = {
+    EVIDENCE_CLOSES: (
+        "the PR title or body declares 'closes/fixes/resolves #N' — Gitea itself "
+        "acts on this keyword, so it is the strongest available evidence"
+    ),
+    EVIDENCE_BRANCH: (
+        "the PR head branch carries the canonical issue marker "
+        "'(fix|feat|docs|chore)/issue-N-…' minted by the issue lock"
+    ),
+    EVIDENCE_REFERENCE: (
+        "the PR body mentions '#N' without a closing keyword; a mention is not "
+        "a claim that the PR closes that issue"
+    ),
+}
+
+_CLOSES_RE = re.compile(r"(?:closes|fixes|resolves)\s+#(\d+)", re.IGNORECASE)
+_REFERENCE_RE = re.compile(r"#(\d+)")
+_BRANCH_MARKER_RE = re.compile(
+    r"^(?:fix|feat|docs|chore)/issue-(\d+)(?:[-/]|$)", re.IGNORECASE
+)
+
+# Handoff-source states. ``not_loaded`` is deliberately distinct from "none
+# found": a row whose comments were never fetched proves nothing about whether
+# a handoff exists on that thread.
+HANDOFF_NOT_LOADED = "not_loaded"
+HANDOFF_LOADED = "loaded"
+HANDOFF_UNAVAILABLE = "unavailable"
+
+# Which item states were fetched. Linkage claims are scoped to this window.
+STATE_OPEN = "open"
+STATE_ALL = "all"
+_SUPPORTED_STATES = (STATE_OPEN, STATE_ALL)
+
+
+def _redact(value: Any) -> Any:
+    """Redact one free-text field, failing closed to the placeholder."""
+    if value is None:
+        return None
+    return console_redaction.redact_text(str(value))
+
+
+def deep_links_enabled(env: dict[str, str] | None = None) -> bool:
+    """Whether Gitea web-UI deep links may be emitted (admin/debug opt-in)."""
+    source = env if env is not None else os.environ
+    return (source.get("GITEA_MCP_REVEAL_ENDPOINTS") or "").strip().lower() in {
+        "1",
+        "true",
+        "yes",
+        "on",
+    }
+
+
+def _deep_link(host: str, org: str, repo: str, kind: str, number: int) -> str | None:
+    """Build a Gitea web link for one item, or None when reveal is not enabled."""
+    if not deep_links_enabled() or not (host and org and repo):
+        return None
+    segment = "pulls" if kind == "pr" else "issues"
+    try:
+        return gitea_url(host, f"/{org}/{repo}/{segment}/{int(number)}")
+    except Exception:
+        return None
+
+
+# --- Pure linkage resolution -------------------------------------------------
+
+
+@dataclass(frozen=True)
+class IssueLink:
+    """One resolved edge from a PR to an issue, with the evidence that found it."""
+
+    issue_number: int
+    evidence: tuple[str, ...]
+
+    @property
+    def strength(self) -> int:
+        """Rank of the strongest evidence backing this edge (lower is stronger)."""
+        return min(
+            (_EVIDENCE_RANK.get(name, len(EVIDENCE_ORDER)) for name in self.evidence),
+            default=len(EVIDENCE_ORDER),
+        )
+
+    @property
+    def closes(self) -> bool:
+        """True only when the PR *declares* it closes the issue."""
+        return EVIDENCE_CLOSES in self.evidence
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "issue_number": self.issue_number,
+            "evidence": list(self.evidence),
+            "closes": self.closes,
+        }
+
+
+def _sorted_links(links: Iterable[IssueLink]) -> tuple[IssueLink, ...]:
+    return tuple(sorted(links, key=lambda link: (link.strength, link.issue_number)))
+
+
+def resolve_pr_links(pr: dict[str, Any]) -> tuple[IssueLink, ...]:
+    """Resolve every issue a PR points at, strongest evidence first.
+
+    Every candidate is kept. Collapsing to a single "linked issue" is what makes
+    a mislinked or double-claimed PR invisible, so the caller decides what to do
+    with several candidates rather than being handed one guess.
+    """
+    found: dict[int, set[str]] = {}
+
+    def _add(number: Any, evidence: str) -> None:
+        try:
+            issue_number = int(number)
+        except (TypeError, ValueError):
+            return
+        if issue_number <= 0:
+            return
+        found.setdefault(issue_number, set()).add(evidence)
+
+    title = str(pr.get("title") or "")
+    body = str(pr.get("body") or "")
+    for text in (title, body):
+        for match in _CLOSES_RE.finditer(text):
+            _add(match.group(1), EVIDENCE_CLOSES)
+
+    head_ref = str((pr.get("head") or {}).get("ref") or "")
+    branch_match = _BRANCH_MARKER_RE.match(head_ref.strip())
+    if branch_match:
+        _add(branch_match.group(1), EVIDENCE_BRANCH)
+
+    # The ``#N`` inside "Closes #N" is the *same* textual occurrence as the
+    # closing keyword, not a second, independent mention. Blanking the closing
+    # phrases first keeps "mention" meaning what the legend says it means: a
+    # reference the PR made without claiming to close anything.
+    for match in _REFERENCE_RE.finditer(_CLOSES_RE.sub(" ", body)):
+        _add(match.group(1), EVIDENCE_REFERENCE)
+
+    # A PR's own number appearing in its body is self-reference, not linkage.
+    try:
+        found.pop(int(pr.get("number")), None)
+    except (TypeError, ValueError):
+        pass
+
+    return _sorted_links(
+        IssueLink(
+            issue_number=number,
+            evidence=tuple(name for name in EVIDENCE_ORDER if name in evidence),
+        )
+        for number, evidence in found.items()
+    )
+
+
+@dataclass(frozen=True)
+class LinkageIndex:
+    """Resolved linkage over one loaded window of issues and PRs."""
+
+    pr_links: dict[int, tuple[IssueLink, ...]]
+    issue_prs: dict[int, tuple[int, ...]]
+
+    def primary_issue(self, pr_number: int) -> IssueLink | None:
+        """The strongest edge for a PR, or None when it points at no issue."""
+        links = self.pr_links.get(int(pr_number)) or ()
+        return links[0] if links else None
+
+    def ambiguous(self, pr_number: int) -> bool:
+        """True when two or more issues tie at the PR's strongest evidence."""
+        links = self.pr_links.get(int(pr_number)) or ()
+        if len(links) < 2:
+            return False
+        best = links[0].strength
+        return sum(1 for link in links if link.strength == best) > 1
+
+    def contested_issues(self) -> tuple[int, ...]:
+        """Issues claimed by more than one PR in the loaded window."""
+        return tuple(
+            number for number, prs in sorted(self.issue_prs.items()) if len(prs) > 1
+        )
+
+
+def resolve_linkage(prs: Sequence[dict[str, Any]]) -> LinkageIndex:
+    """Build the bidirectional linkage index for a loaded window of PRs.
+
+    Only *closing* and *branch-marker* edges populate the issue→PR direction: a
+    bare ``#N`` mention is a reference, and treating it as "this PR is the work
+    for issue N" would invent contested issues out of ordinary cross-links. The
+    weaker edge stays visible on the PR→issue side, where it is labelled.
+    """
+    pr_links: dict[int, tuple[IssueLink, ...]] = {}
+    issue_prs: dict[int, list[int]] = {}
+    for pr in prs or []:
+        try:
+            pr_number = int(pr["number"])
+        except (KeyError, TypeError, ValueError):
+            continue
+        links = resolve_pr_links(pr)
+        pr_links[pr_number] = links
+        for link in links:
+            if link.evidence == (EVIDENCE_REFERENCE,):
+                continue
+            bucket = issue_prs.setdefault(link.issue_number, [])
+            if pr_number not in bucket:
+                bucket.append(pr_number)
+    return LinkageIndex(
+        pr_links=pr_links,
+        issue_prs={number: tuple(sorted(items)) for number, items in issue_prs.items()},
+    )
+
+
+# --- Canonical handoff summary ----------------------------------------------
+
+
+@dataclass(frozen=True)
+class HandoffSummary:
+    """The latest CTH comment on one thread, redacted for display."""
+
+    comment_id: int | None
+    created_at: str | None
+    author: str | None
+    cth_type: str
+    cth_type_known: bool
+    status: str | None
+    next_owner: str | None
+    current_blocker: str | None
+    decision: str | None
+    next_action: str | None
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "comment_id": self.comment_id,
+            "created_at": self.created_at,
+            "author": self.author,
+            "cth_type": self.cth_type,
+            "cth_type_known": self.cth_type_known,
+            "status": self.status,
+            "next_owner": self.next_owner,
+            "current_blocker": self.current_blocker,
+            "decision": self.decision,
+            "next_action": self.next_action,
+        }
+
+
+@dataclass(frozen=True)
+class HandoffStatus:
+    """Why a thread's handoff summary is present, absent, or unknown."""
+
+    state: str
+    reason: str | None = None
+    target: str | None = None
+
+    @property
+    def loaded(self) -> bool:
+        return self.state == HANDOFF_LOADED
+
+    def to_dict(self) -> dict[str, Any]:
+        return {"state": self.state, "reason": self.reason, "target": self.target}
+
+
+def summarize_handoff(comments: Sequence[dict[str, Any]]) -> HandoffSummary | None:
+    """Summarize the newest CTH comment in *comments*, or None when there is none.
+
+    Every field is redacted before it is returned: a handoff body is operator
+    free text that regularly quotes commands, and it is rendered verbatim on the
+    page this feeds.
+    """
+    from canonical_thread_handoff import find_latest_cth, is_known_cth_type
+
+    try:
+        latest = find_latest_cth(list(comments or []))
+    except Exception:
+        return None
+    if not latest:
+        return None
+    fields = latest.get("fields") or {}
+    cth_type = str(latest.get("cth_type") or "").strip()
+    known = is_known_cth_type(cth_type)
+    try:
+        comment_id: int | None = int(latest.get("comment_id"))
+    except (TypeError, ValueError):
+        comment_id = None
+    return HandoffSummary(
+        comment_id=comment_id,
+        created_at=_redact(latest.get("created_at")),
+        author=_redact(latest.get("author")),
+        # An unrecognised heading is reported as such rather than republished:
+        # the heading is free text, and CTH_TYPES is the only authority for what
+        # a handoff type may be.
+        cth_type=cth_type if known else "unrecognized",
+        cth_type_known=known,
+        status=_redact(fields.get("status")),
+        next_owner=_redact(fields.get("next owner")),
+        current_blocker=_redact(fields.get("current blocker")),
+        decision=_redact(fields.get("decision")),
+        next_action=_redact(fields.get("next action")),
+    )
+
+
+CommentSource = Callable[[str, int], list[dict[str, Any]]]
+
+
+def build_comment_source(host: str, org: str, repo: str) -> CommentSource | None:
+    """Build an authenticated ``(kind, number) -> comments`` fetcher, or None.
+
+    Returns None when the console is running in offline test mode or when no
+    credential is available for *host*, so the caller reports the handoff source
+    as unavailable instead of as an empty thread.
+    """
+    if _offline_test_mode() or not (host and org and repo):
+        return None
+    auth = get_auth_header(host)
+    if not auth:
+        return None
+
+    def _fetch(kind: str, number: int) -> list[dict[str, Any]]:
+        segment = "pulls" if kind == "pr" else "issues"
+        url = f"{repo_api_url(host, org, repo)}/{segment}/{int(number)}/comments"
+        comments: list[dict[str, Any]] = []
+        page = 1
+        while page <= 20:
+            raw, meta = api_fetch_page(url, auth, page=page, limit=50)
+            comments.extend(raw)
+            if bool(meta["is_final_page"]):
+                break
+            page += 1
+        return comments
+
+    return _fetch
+
+
+# --- Snapshot ----------------------------------------------------------------
+
+
+@dataclass(frozen=True)
+class LinkageNode:
+    """One issue or PR row with its resolved links and display metadata."""
+
+    kind: str
+    number: int
+    title: str
+    state: str
+    labels: tuple[str, ...] = ()
+    links: tuple[IssueLink, ...] = ()
+    linked_prs: tuple[int, ...] = ()
+    ambiguous: bool = False
+    contested: bool = False
+    deep_link: str | None = None
+    handoff: HandoffSummary | None = None
+    handoff_status: HandoffStatus = HandoffStatus(HANDOFF_NOT_LOADED)
+    links_authoritative: bool = True
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "kind": self.kind,
+            "number": self.number,
+            "title": self.title,
+            "state": self.state,
+            "labels": list(self.labels),
+            "links": [link.to_dict() for link in self.links],
+            "linked_prs": list(self.linked_prs),
+            "ambiguous": self.ambiguous,
+            "contested": self.contested,
+            "deep_link": self.deep_link,
+            "links_authoritative": self.links_authoritative,
+            "handoff": self.handoff.to_dict() if self.handoff else None,
+            "handoff_status": self.handoff_status.to_dict(),
+        }
+
+
+@dataclass(frozen=True)
+class LinkageSnapshot:
+    """One answered linkage query over a scoped window of a Gitea repo."""
+
+    ok: bool
+    project_id: str
+    repo_label: str
+    host: str
+    state_scope: str
+    issues: tuple[LinkageNode, ...] = ()
+    prs: tuple[LinkageNode, ...] = ()
+    contested_issues: tuple[int, ...] = ()
+    focus: tuple[str, int] | None = None
+    inventory_complete: bool = False
+    deep_links_enabled: bool = False
+    handoff_status: HandoffStatus = HandoffStatus(HANDOFF_NOT_LOADED)
+    fetch_error: str | None = None
+
+    @property
+    def orphan_prs(self) -> tuple[LinkageNode, ...]:
+        """PRs in the loaded window that point at no issue at all."""
+        return tuple(node for node in self.prs if not node.links)
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "ok": self.ok,
+            "schema_version": LINKAGE_SCHEMA_VERSION,
+            "project_id": self.project_id,
+            "repo": self.repo_label,
+            "state_scope": self.state_scope,
+            "inventory_complete": self.inventory_complete,
+            "deep_links_enabled": self.deep_links_enabled,
+            "focus": (
+                None
+                if self.focus is None
+                else {"kind": self.focus[0], "number": self.focus[1]}
+            ),
+            "handoff_source": self.handoff_status.to_dict(),
+            "fetch_error": self.fetch_error,
+            "contested_issues": list(self.contested_issues),
+            "issues": [node.to_dict() for node in self.issues],
+            "prs": [node.to_dict() for node in self.prs],
+            "evidence_kinds": [
+                {"name": name, "description": EVIDENCE_DESCRIPTIONS[name]}
+                for name in EVIDENCE_ORDER
+            ],
+        }
+
+
+def snapshot_to_dict(snapshot: LinkageSnapshot) -> dict[str, Any]:
+    """JSON-serializable export for ``/api/v1/gitea/linkage``."""
+    return snapshot.to_dict()
+
+
+def _offline_test_mode() -> bool:
+    return (os.environ.get("WEBUI_TEST_OFFLINE") or "").strip().lower() in {
+        "1",
+        "true",
+        "yes",
+    }
+
+
+def _labels_of(item: dict[str, Any]) -> tuple[str, ...]:
+    return tuple(
+        str(_redact(label.get("name")))
+        for label in (item.get("labels") or [])
+        if label.get("name")
+    )
+
+
+def _failed_snapshot(
+    *,
+    project_id: str,
+    repo_label: str,
+    host: str,
+    state_scope: str,
+    reason: str,
+) -> LinkageSnapshot:
+    """A read that could not be answered. Never an empty-and-healthy snapshot."""
+    return LinkageSnapshot(
+        ok=False,
+        project_id=project_id,
+        repo_label=repo_label,
+        host=host,
+        state_scope=state_scope,
+        inventory_complete=False,
+        deep_links_enabled=deep_links_enabled(),
+        handoff_status=HandoffStatus(
+            HANDOFF_UNAVAILABLE, reason="linkage inventory could not be loaded"
+        ),
+        fetch_error=str(_redact(reason)),
+    )
+
+
+def _resolve_project(project_id: str | None) -> ProjectRecord | None:
+    registry = load_registry()
+    if project_id:
+        for entry in registry.projects:
+            if entry.id == project_id:
+                return entry
+        return None
+    return registry.projects[0] if registry.projects else None
+
+
+def _normalize_state(state: str | None) -> str:
+    text = (state or STATE_OPEN).strip().lower()
+    return text if text in _SUPPORTED_STATES else STATE_OPEN
+
+
+def load_linkage_snapshot(
+    project_id: str | None = None,
+    *,
+    state: str | None = None,
+    issue: int | None = None,
+    pr: int | None = None,
+    fetch_prs: Callable[..., tuple[list[dict], PaginationMeta]] | None = None,
+    fetch_issues: Callable[..., tuple[list[dict], PaginationMeta]] | None = None,
+    comment_source: CommentSource | None = None,
+) -> LinkageSnapshot:
+    """Load issue↔PR linkage for a registry project.
+
+    ``issue``/``pr`` focus one thread: the focused row is the only one whose
+    Canonical Thread Handoff comments are fetched, because handoff comments are
+    thread-scoped and loading them for a whole queue would be one request per
+    row. Every unfocused row reports its handoff as ``not_loaded``.
+    """
+    state_scope = _normalize_state(state)
+    try:
+        project = _resolve_project(project_id)
+    except Exception as exc:  # registry invalid — fail closed with the reason
+        return _failed_snapshot(
+            project_id=project_id or "",
+            repo_label="",
+            host="",
+            state_scope=state_scope,
+            reason=f"project registry unavailable: {exc}",
+        )
+
+    if project is None:
+        return _failed_snapshot(
+            project_id=project_id or "",
+            repo_label="",
+            host="",
+            state_scope=state_scope,
+            reason=(
+                f"project {project_id!r} not found in registry"
+                if project_id
+                else "no projects registered"
+            ),
+        )
+
+    host = _host_from_url(project.remote_host)
+    repo_label = f"{project.gitea_owner}/{project.repo_name}"
+    offline_test = _offline_test_mode()
+
+    def _empty_fetch(*_args, **_kwargs):
+        return [], PaginationMeta(
+            page=1,
+            per_page=50,
+            returned_count=0,
+            has_more=False,
+            is_final_page=True,
+            # An offline stub loaded nothing; claiming a complete inventory here
+            # would let the page assert that no issue has a linked PR.
+            inventory_complete=False,
+            pages_fetched=0,
+        )
+
+    pr_fetch = fetch_prs or (_empty_fetch if offline_test else _fetch_prs)
+    issue_fetch = fetch_issues or (_empty_fetch if offline_test else _fetch_issues)
+    using_live_fetch = not offline_test and (fetch_prs is None or fetch_issues is None)
+    auth = get_auth_header(host) if using_live_fetch else "test-auth"
+    if using_live_fetch and not auth:
+        return _failed_snapshot(
+            project_id=project.id,
+            repo_label=repo_label,
+            host=host,
+            state_scope=state_scope,
+            reason=(
+                f"Gitea credentials unavailable for {host}; linkage cannot be "
+                "loaded (fail closed — not rendering an empty linkage table)"
+            ),
+        )
+
+    try:
+        raw_prs, pr_pagination = pr_fetch(
+            host, project.gitea_owner, project.repo_name, auth, state=state_scope
+        )
+        raw_issues, issue_pagination = issue_fetch(
+            host, project.gitea_owner, project.repo_name, auth, state=state_scope
+        )
+    except Exception as exc:  # noqa: BLE001 — operator-visible fetch failure
+        return _failed_snapshot(
+            project_id=project.id,
+            repo_label=repo_label,
+            host=host,
+            state_scope=state_scope,
+            reason=f"Gitea fetch failed: {exc}",
+        )
+
+    inventory_complete = bool(
+        getattr(pr_pagination, "inventory_complete", False)
+        and getattr(issue_pagination, "inventory_complete", False)
+    )
+
+    index = resolve_linkage(raw_prs)
+    contested = index.contested_issues()
+
+    focus: tuple[str, int] | None = None
+    if pr is not None:
+        focus = ("pr", int(pr))
+    elif issue is not None:
+        focus = ("issue", int(issue))
+
+    unfocused_reason = (
+        "canonical handoff comments are thread-scoped; focus one issue or PR "
+        "to load its latest handoff"
+    )
+    handoff_status = HandoffStatus(HANDOFF_NOT_LOADED, reason=unfocused_reason)
+    focus_handoff: HandoffSummary | None = None
+    if focus is not None:
+        source = comment_source
+        if source is None and not offline_test:
+            source = build_comment_source(host, project.gitea_owner, project.repo_name)
+        target = f"{focus[0]}#{focus[1]}"
+        if source is None:
+            handoff_status = HandoffStatus(
+                HANDOFF_UNAVAILABLE,
+                reason="no authenticated comment source available for this read",
+                target=target,
+            )
+        else:
+            try:
+                focus_handoff = summarize_handoff(source(focus[0], focus[1]) or [])
+                handoff_status = HandoffStatus(HANDOFF_LOADED, target=target)
+            except Exception as exc:  # fail soft: degrade this source only
+                handoff_status = HandoffStatus(
+                    HANDOFF_UNAVAILABLE,
+                    reason=str(_redact(f"handoff fetch failed: {exc}")),
+                    target=target,
+                )
+
+    def _node_handoff(
+        kind: str, number: int
+    ) -> tuple[HandoffSummary | None, HandoffStatus]:
+        """Attach the handoff only to the focused row; qualify every other row."""
+        if focus == (kind, number):
+            return (focus_handoff, handoff_status)
+        return (
+            None,
+            HandoffStatus(
+                HANDOFF_NOT_LOADED,
+                reason=unfocused_reason if focus is None else "not the focused thread",
+            ),
+        )
+
+    def _number_of(raw: dict[str, Any]) -> int | None:
+        try:
+            return int(raw["number"])
+        except (KeyError, TypeError, ValueError):
+            return None
+
+    def _sort_key(raw: dict[str, Any]) -> int:
+        number = _number_of(raw)
+        return -1 if number is None else number
+
+    issue_nodes: list[LinkageNode] = []
+    for raw in sorted(raw_issues or [], key=_sort_key, reverse=True):
+        number = _number_of(raw)
+        if number is None:
+            continue
+        node_handoff, node_status = _node_handoff("issue", number)
+        linked_prs = index.issue_prs.get(number, ())
+        issue_nodes.append(
+            LinkageNode(
+                kind="issue",
+                number=number,
+                title=str(_redact(raw.get("title")) or ""),
+                state=str(raw.get("state") or ""),
+                labels=_labels_of(raw),
+                linked_prs=linked_prs,
+                contested=len(linked_prs) > 1,
+                deep_link=_deep_link(
+                    host, project.gitea_owner, project.repo_name, "issue", number
+                ),
+                handoff=node_handoff,
+                handoff_status=node_status,
+                links_authoritative=inventory_complete,
+            )
+        )
+
+    pr_nodes: list[LinkageNode] = []
+    for raw in sorted(raw_prs or [], key=_sort_key, reverse=True):
+        number = _number_of(raw)
+        if number is None:
+            continue
+        node_handoff, node_status = _node_handoff("pr", number)
+        links = index.pr_links.get(number, ())
+        pr_nodes.append(
+            LinkageNode(
+                kind="pr",
+                number=number,
+                title=str(_redact(raw.get("title")) or ""),
+                state=str(raw.get("state") or ""),
+                labels=_labels_of(raw),
+                links=links,
+                ambiguous=index.ambiguous(number),
+                contested=any(link.issue_number in contested for link in links),
+                deep_link=_deep_link(
+                    host, project.gitea_owner, project.repo_name, "pr", number
+                ),
+                handoff=node_handoff,
+                handoff_status=node_status,
+                links_authoritative=inventory_complete,
+            )
+        )
+
+    return LinkageSnapshot(
+        ok=True,
+        project_id=project.id,
+        repo_label=repo_label,
+        host=host,
+        state_scope=state_scope,
+        issues=tuple(issue_nodes),
+        prs=tuple(pr_nodes),
+        contested_issues=contested,
+        focus=focus,
+        inventory_complete=inventory_complete,
+        deep_links_enabled=deep_links_enabled(),
+        handoff_status=handoff_status,
+    )

webui/linkage_views.py

@@ -0,0 +1,364 @@
+"""HTML views for the Gitea issue↔PR linkage console (#645, Phase 3).
+
+Read-only renderer over :mod:`webui.linkage_loader`. The page's job is to make
+three things impossible to misread:
+
+* **why** an edge exists — every link carries its evidence badge, so a bare
+  ``#N`` mention never looks like a closing claim;
+* **what was not loaded** — a partial inventory, an unfocused thread, or an
+  unavailable handoff source renders as an explicit qualifier, never as an
+  affirmative "none";
+* **that nothing here mutates** — there is no review, merge, or edit control,
+  and the deep link out to Gitea appears only under the admin reveal opt-in.
+"""
+
+from __future__ import annotations
+
+from html import escape
+from typing import Sequence
+
+from webui.layout import render_page
+from webui.linkage_loader import (
+    EVIDENCE_BRANCH,
+    EVIDENCE_CLOSES,
+    EVIDENCE_DESCRIPTIONS,
+    EVIDENCE_ORDER,
+    EVIDENCE_REFERENCE,
+    HANDOFF_LOADED,
+    HANDOFF_NOT_LOADED,
+    HandoffSummary,
+    LinkageNode,
+    LinkageSnapshot,
+)
+
+_EVIDENCE_CSS = {
+    EVIDENCE_CLOSES: "badge-health-ok",
+    EVIDENCE_BRANCH: "badge-health-skipped",
+    EVIDENCE_REFERENCE: "badge-health-unproven",
+}
+
+_EVIDENCE_LABEL = {
+    EVIDENCE_CLOSES: "closes",
+    EVIDENCE_BRANCH: "branch",
+    EVIDENCE_REFERENCE: "mention",
+}
+
+
+def _badge(text: str, css: str) -> str:
+    return f'<span class="badge {css}">{escape(text)}</span>'
+
+
+def _labels(names: Sequence[str]) -> str:
+    if not names:
+        return '<span class="muted">—</span>'
+    return " ".join(_badge(name, "badge-health-skipped") for name in names)
+
+
+def _ref(node: LinkageNode) -> str:
+    """Render an item reference, hyperlinked only when deep links are revealed."""
+    label = f"#{node.number}"
+    if node.deep_link:
+        return f'<a href="{escape(node.deep_link)}"><code>{escape(label)}</code></a>'
+    return f"<code>{escape(label)}</code>"
+
+
+def _scope_card(snapshot: LinkageSnapshot) -> str:
+    focus = (
+        "none"
+        if snapshot.focus is None
+        else f"{snapshot.focus[0]}#{snapshot.focus[1]}"
+    )
+    completeness = (
+        _badge("complete", "badge-health-ok")
+        if snapshot.inventory_complete
+        else _badge("partial", "badge-health-degraded")
+    )
+    links_note = (
+        "Every linkage edge below is a claim about this loaded window only."
+        if snapshot.inventory_complete
+        else (
+            "Pagination did not complete for this window, so an empty link list "
+            "means <em>none found in what was loaded</em> — not that no link exists."
+        )
+    )
+    deep_links = (
+        _badge("enabled", "badge-health-ok")
+        if snapshot.deep_links_enabled
+        else _badge("hidden", "badge-health-skipped")
+    )
+    return f"""<div class="health-card">
+  <h3>Scope</h3>
+  <table class="detail">
+    <tr><th>Project</th><td><code>{escape(snapshot.project_id or "—")}</code></td></tr>
+    <tr><th>Repository</th><td><code>{escape(snapshot.repo_label or "—")}</code></td></tr>
+    <tr><th>Item state</th><td><code>{escape(snapshot.state_scope)}</code></td></tr>
+    <tr><th>Focused thread</th><td><code>{escape(focus)}</code></td></tr>
+    <tr><th>Inventory</th><td>{completeness}</td></tr>
+    <tr><th>Gitea deep links</th><td>{deep_links}</td></tr>
+  </table>
+  <p class="muted">{links_note}</p>
+</div>"""
+
+
+def _error_card(snapshot: LinkageSnapshot) -> str:
+    if snapshot.ok and not snapshot.fetch_error:
+        return ""
+    return (
+        '<div class="health-card health-stale"><strong>Linkage unavailable:</strong> '
+        f"{escape(snapshot.fetch_error or 'the linkage read did not complete')}. "
+        "No linkage table is rendered: an empty table would read as "
+        "<em>no issue is linked to any PR</em>, which this read cannot claim."
+        "</div>"
+    )
+
+
+def _contested_card(snapshot: LinkageSnapshot) -> str:
+    if not snapshot.contested_issues:
+        return ""
+    refs = ", ".join(f"<code>#{number}</code>" for number in snapshot.contested_issues)
+    return (
+        '<div class="health-card health-stale">'
+        f"<strong>Contested issues:</strong> {refs}. More than one PR in this "
+        "window claims each of these — duplicate work or a superseded PR. "
+        "Resolution stays in Gitea and the workflow; this console only reports it."
+        "</div>"
+    )
+
+
+def _evidence_badges(evidence: Sequence[str]) -> str:
+    return " ".join(
+        _badge(
+            _EVIDENCE_LABEL.get(name, name),
+            _EVIDENCE_CSS.get(name, "badge-health-skipped"),
+        )
+        for name in EVIDENCE_ORDER
+        if name in evidence
+    )
+
+
+def _handoff_inline(handoff: HandoffSummary) -> str:
+    type_css = "badge-health-ok" if handoff.cth_type_known else "badge-health-degraded"
+    return (
+        f'{_badge(handoff.cth_type or "—", type_css)}'
+        f'<div class="muted" style="font-size:0.82rem;">'
+        f'{escape(handoff.status or "—")} → {escape(handoff.next_owner or "—")}</div>'
+    )
+
+
+def _handoff_cell(node: LinkageNode) -> str:
+    """Render the handoff column, distinguishing 'none found' from 'not loaded'."""
+    status = node.handoff_status
+    if status.state == HANDOFF_LOADED:
+        if node.handoff is None:
+            return '<span class="muted">no canonical handoff on this thread</span>'
+        return _handoff_inline(node.handoff)
+    if status.state == HANDOFF_NOT_LOADED:
+        return (
+            f'{_badge("not loaded", "badge-health-skipped")}'
+            f'<div class="muted" style="font-size:0.82rem;">'
+            f'{escape(status.reason or "")}</div>'
+        )
+    return (
+        f'{_badge("unavailable", "badge-health-degraded")}'
+        f'<div class="muted" style="font-size:0.82rem;">'
+        f'{escape(status.reason or "")}</div>'
+    )
+
+
+def _issue_rows(snapshot: LinkageSnapshot) -> str:
+    rows = []
+    for node in snapshot.issues:
+        if node.linked_prs:
+            linked = ", ".join(f"<code>#{number}</code>" for number in node.linked_prs)
+            if node.contested:
+                linked += " " + _badge("contested", "badge-blocked")
+        elif node.links_authoritative:
+            linked = '<span class="muted">none</span>'
+        else:
+            # The distinction an operator needs: nothing found in a window that
+            # was not fully loaded is not the same as nothing existing.
+            linked = '<span class="muted">none found (partial inventory)</span>'
+        rows.append(
+            "<tr>"
+            f"<td>{_ref(node)}</td>"
+            f"<td>{escape(node.title)}</td>"
+            f"<td>{escape(node.state or '—')}</td>"
+            f"<td>{_labels(node.labels)}</td>"
+            f"<td>{linked}</td>"
+            f"<td>{_handoff_cell(node)}</td>"
+            "</tr>"
+        )
+    if not rows:
+        return '<tr><td colspan="6" class="muted">No issues in the loaded window.</td></tr>'
+    return "".join(rows)
+
+
+def _pr_rows(snapshot: LinkageSnapshot) -> str:
+    rows = []
+    for node in snapshot.prs:
+        if node.links:
+            linked = "".join(
+                f"<div><code>#{link.issue_number}</code> "
+                f"{_evidence_badges(link.evidence)}</div>"
+                for link in node.links
+            )
+            if node.ambiguous:
+                linked += _badge("ambiguous", "badge-blocked")
+            if node.contested:
+                linked += " " + _badge("contested", "badge-blocked")
+        elif node.links_authoritative:
+            linked = '<span class="muted">no issue reference</span>'
+        else:
+            linked = '<span class="muted">none found (partial inventory)</span>'
+        rows.append(
+            "<tr>"
+            f"<td>{_ref(node)}</td>"
+            f"<td>{escape(node.title)}</td>"
+            f"<td>{escape(node.state or '—')}</td>"
+            f"<td>{_labels(node.labels)}</td>"
+            f"<td>{linked}</td>"
+            f"<td>{_handoff_cell(node)}</td>"
+            "</tr>"
+        )
+    if not rows:
+        return (
+            '<tr><td colspan="6" class="muted">No pull requests in the loaded '
+            "window.</td></tr>"
+        )
+    return "".join(rows)
+
+
+def _focus_card(snapshot: LinkageSnapshot) -> str:
+    """Render the focused thread's latest canonical handoff, when one was loaded."""
+    if snapshot.focus is None:
+        return f"""<div class="prompt-card">
+  <h3>Canonical handoff</h3>
+  <p class="muted">{escape(snapshot.handoff_status.reason or "")}
+  Add <code>?issue=N</code> or <code>?pr=N</code> to load the latest
+  Canonical Thread Handoff for one thread.</p>
+</div>"""
+
+    kind, number = snapshot.focus
+    target = f"{kind} #{number}"
+    if not snapshot.handoff_status.loaded:
+        return f"""<div class="prompt-card">
+  <h3>Canonical handoff — {escape(target)}</h3>
+  <p class="muted">{_badge("unavailable", "badge-health-degraded")}
+  {escape(snapshot.handoff_status.reason or "handoff source did not run")}.
+  This is not evidence that the thread carries no handoff.</p>
+</div>"""
+
+    handoff = next(
+        (
+            node.handoff
+            for node in (snapshot.issues + snapshot.prs)
+            if node.kind == kind and node.number == number and node.handoff
+        ),
+        None,
+    )
+    if handoff is None:
+        return f"""<div class="prompt-card">
+  <h3>Canonical handoff — {escape(target)}</h3>
+  <p class="muted">Comments loaded; no Canonical Thread Handoff comment found on
+  this thread.</p>
+</div>"""
+
+    type_css = "badge-health-ok" if handoff.cth_type_known else "badge-health-degraded"
+    unknown_note = (
+        ""
+        if handoff.cth_type_known
+        else (
+            '<p class="muted">The comment\'s heading is not a declared CTH type, '
+            "so it is reported as unrecognized rather than republished.</p>"
+        )
+    )
+    return f"""<div class="prompt-card">
+  <h3>Canonical handoff — {escape(target)}</h3>
+  <p class="meta">{_badge(handoff.cth_type or "—", type_css)}
+  by <code>{escape(handoff.author or "unknown")}</code>
+  at <code>{escape(handoff.created_at or "unknown")}</code></p>
+  {unknown_note}
+  <table class="detail">
+    <tr><th>Status</th><td>{escape(handoff.status or "—")}</td></tr>
+    <tr><th>Next owner</th><td>{escape(handoff.next_owner or "—")}</td></tr>
+    <tr><th>Current blocker</th><td>{escape(handoff.current_blocker or "—")}</td></tr>
+    <tr><th>Decision</th><td>{escape(handoff.decision or "—")}</td></tr>
+    <tr><th>Next action</th><td>{escape(handoff.next_action or "—")}</td></tr>
+  </table>
+  <p class="muted">Full event history:
+  <a href="/api/v1/timeline?{escape(kind)}={number}"><code>/api/v1/timeline</code></a></p>
+</div>"""
+
+
+def _legend_card(snapshot: LinkageSnapshot) -> str:
+    items = "".join(
+        f"<li>{_badge(_EVIDENCE_LABEL[name], _EVIDENCE_CSS[name])} — "
+        f"{escape(EVIDENCE_DESCRIPTIONS[name])}</li>"
+        for name in EVIDENCE_ORDER
+    )
+    reveal_note = (
+        "Gitea deep links are shown because the "
+        "<code>GITEA_MCP_REVEAL_ENDPOINTS</code> admin opt-in is set."
+        if snapshot.deep_links_enabled
+        else (
+            "Gitea deep links are withheld. Set "
+            "<code>GITEA_MCP_REVEAL_ENDPOINTS=1</code> server-side to reveal "
+            "them; item numbers stay usable without them."
+        )
+    )
+    return f"""<div class="prompt-card">
+  <h3>How an edge was found</h3>
+  <ul class="reasons">{items}</ul>
+  <p class="muted">{reveal_note}</p>
+  <p class="muted">Read-only surface: no issue or PR editing, no review, and no merge.
+  JSON export: <a href="/api/v1/gitea/linkage"><code>/api/v1/gitea/linkage</code></a></p>
+</div>"""
+
+
+def render_linkage_page(snapshot: LinkageSnapshot) -> str:
+    """Render the full HTML page for the Gitea linkage console."""
+    if not snapshot.ok:
+        return render_page(
+            title="Gitea linkage",
+            body_html=f"""<h2>Gitea issue and PR linkage</h2>
+<p class="meta">Phase 3 read-only linkage console (#645).</p>
+{_error_card(snapshot)}
+{_scope_card(snapshot)}""",
+        )
+
+    body = f"""<h2>Gitea issue and PR linkage</h2>
+<p class="meta">Phase 3 read-only linkage console (#645). Gitea remains the source of
+truth; this page reads it and never writes to it.</p>
+{_scope_card(snapshot)}
+{_contested_card(snapshot)}
+
+<div class="prompt-card">
+  <h3>Issues → pull requests</h3>
+  <table class="registry">
+    <thead>
+      <tr>
+        <th>Issue</th><th>Title</th><th>State</th><th>Labels</th>
+        <th>Linked PRs</th><th>Latest handoff</th>
+      </tr>
+    </thead>
+    <tbody>{_issue_rows(snapshot)}</tbody>
+  </table>
+</div>
+
+<div class="prompt-card">
+  <h3>Pull requests → issues</h3>
+  <table class="registry">
+    <thead>
+      <tr>
+        <th>PR</th><th>Title</th><th>State</th><th>Labels</th>
+        <th>Linked issues</th><th>Latest handoff</th>
+      </tr>
+    </thead>
+    <tbody>{_pr_rows(snapshot)}</tbody>
+  </table>
+</div>
+
+{_focus_card(snapshot)}
+{_legend_card(snapshot)}
+"""
+    return render_page(title="Gitea linkage", body_html=body)

webui/nav.py

@@ -4,11 +4,11 @@ Single source of truth for the console navigation so ``webui/layout.py`` and
 the ``webui/app.py`` route table stay aligned with epic #631. Read-only: every
 destination is a GET view or a Phase 1 placeholder. No mutation links.
 
-Nav groups follow the #631 Phase 1 information architecture: Health, Traffic,
+Nav groups follow the #631 information architecture: Health, Traffic,
 Runtime/Sessions, Projects, Inventory, Timeline, Policy (placeholder), and
-Insights (placeholder). Later-phase surfaces are declared as ``stub`` items and
-backed by ``STUB_PAGES`` so their nav links resolve to a graceful placeholder
-instead of a 404.
+Gitea linkage (#645) plus Phase 4 Insights/Providers (#650). Later-phase
+surfaces are declared as ``stub`` items and backed by ``STUB_PAGES`` so their
+nav links resolve to a graceful placeholder instead of a 404.
 """
 
 from __future__ import annotations
@@ -60,12 +60,16 @@ NAV_GROUPS: tuple[NavGroup, ...] = (
     NavGroup("Timeline", (
         NavItem("/timeline", "Timeline", "stub"),
     )),
+    NavGroup("Gitea", (
+        NavItem("/gitea", "Issue/PR linkage"),
+    )),
     NavGroup("Policy", (
         NavItem("/policy", "Policy", "stub"),
         NavItem("/prompts", "Prompts"),
     )),
     NavGroup("Insights", (
-        NavItem("/insights", "Insights", "stub"),
+        NavItem("/insights", "Insights"),
+        NavItem("/providers", "Providers"),
         NavItem("/analytics", "Analytics"),
         NavItem("/audit", "Audit"),
     )),
@@ -89,11 +93,6 @@ STUB_PAGES: dict[str, tuple[str, str]] = {
         "Policy",
         "Capability and role policy surface. Placeholder until a later phase.",
     ),
-    "/insights": (
-        "Insights",
-        "Aggregate operational insights and trends. Placeholder until a later "
-        "phase.",
-    ),
 }
 
 

webui/queue_loader.py

@@ -211,6 +211,19 @@ def _pagination_from_pages(
     )
 
 
+_SUPPORTED_FETCH_STATES = ("open", "closed", "all")
+
+
+def _safe_state(state: str | None) -> str:
+    """Constrain a caller-supplied item state before it reaches a query string.
+
+    The value is interpolated into the Gitea URL, so an unrecognised state falls
+    back to ``open`` rather than being passed through.
+    """
+    text = (state or "open").strip().lower()
+    return text if text in _SUPPORTED_FETCH_STATES else "open"
+
+
 def _fetch_prs(
     host: str,
     org: str,
@@ -218,8 +231,15 @@ def _fetch_prs(
     auth: str,
     *,
     per_page: int = 50,
+    state: str = "open",
 ) -> tuple[list[dict], PaginationMeta]:
-    url = f"{repo_api_url(host, org, repo)}/pulls?state=open"
+    """Fetch PRs in *state* (``open``, ``closed``, or ``all``).
+
+    The queue dashboard only ever wants the open window, so ``open`` stays the
+    default. The linkage console (#645) widens it, because a landed issue↔PR
+    edge lives on a merged PR.
+    """
+    url = f"{repo_api_url(host, org, repo)}/pulls?state={_safe_state(state)}"
     all_raw: list[dict] = []
     pages_fetched = 0
     is_final = False
@@ -248,8 +268,13 @@ def _fetch_issues(
     auth: str,
     *,
     per_page: int = 50,
+    state: str = "open",
 ) -> tuple[list[dict], PaginationMeta]:
-    url = f"{repo_api_url(host, org, repo)}/issues?state=open&type=issues"
+    """Fetch issues in *state* (``open``, ``closed``, or ``all``); see :func:`_fetch_prs`."""
+    url = (
+        f"{repo_api_url(host, org, repo)}/issues"
+        f"?state={_safe_state(state)}&type=issues"
+    )
     all_raw: list[dict] = []
     page = 1
     pages_fetched = 0