Merge branch 'master' into feat/issue-663-restart-classes

Address PR #885 REQUEST_CHANGES: full head_sha pins from queue signals,
reviewer leases keyed by pr_number only, claim inventory via entries,
live-path fixture tests, and traffic state vocabulary docs.

Closes #640 (re-review at new head)

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

docs/mcp-restart-classes.md

@@ -0,0 +1,53 @@
+# MCP restart classes and blast-radius permissions (#663)
+
+This is the machine-enforced class matrix used by
+`restart_coordinator.RESTART_CLASS_POLICIES`. It implements the narrower-first
+recovery ladder from #655 and the authorization policy from #656, using the
+path inventory from #657 and the impact coordinator from #658. Product and
+delivery lineage: vision #652 and roadmap #653.
+
+Unknown class names are denied. The coordinator requires both the class
+permission and an eligible request role. Approval gates are additional: a
+caller cannot turn a request permission into execution authority.
+
+| Restart class | Required permission | Expected blast radius | Drain requirement | Approval requirement | Audit requirement | Recovery behavior |
+|---|---|---|---|---|---|---|
+| `client_reconnect` | `mcp.reconnect.client` | none | none | self service | class, actor, client namespace, reason, outcome | Reconnect only the caller's client transport. No daemon or peer work changes. |
+| `session_reconnect` | `mcp.reconnect.session` | low | requesting-session safe point | self service | class, actor, session, reason, outcome | Rebind identity, capability, and workspace state for one session. |
+| `worker_restart` | `mcp.restart.worker.request` | low | target worker | controller approval + automated gates | class, actor, worker, approval, scoped drain, outcome | Restart one worker after its own leases and mutations drain. |
+| `role_runtime_restart` | `mcp.restart.role_runtime.request` | medium | target role runtime | controller approval + automated gates | class, actor, role namespace, approval, scoped drain, outcome | Restart and re-probe one role runtime; unrelated roles remain available. |
+| `connector_restart` | `mcp.restart.connector.request` | medium | target connector | controller approval + automated gates | class, actor, connector, approval, scoped drain, outcome | Restart one connector while unrelated runtimes remain available. |
+| `configuration_reload` | `mcp.reload.configuration.request` | low | mutation quiesce | controller approval + automated gates | class, actor, configuration revision, approval, outcome | Gracefully reload configuration without replacing the daemon. |
+| `rolling_mcp_restart` | `mcp.restart.rolling.request` | medium | one instance at a time | controller approval + automated gates | class, actor, instance order, approval, per-instance drains, outcome | Drain, restart, verify, and restore each instance before advancing. |
+| `full_mcp_restart` | `mcp.restart.full.request` | high | all sessions and mutations | controller approval + automated gates | class, actor, full impact, approval, full drain proof, outcome | Replace the complete MCP runtime only after a verified full drain. |
+| `host_restart` | `mcp.restart.host.request` | high | all host work | controller approval + infrastructure operator | class, actor, host/change or incident id, approval, full drain proof, outcome | Hand off to infrastructure ownership and reconcile every runtime afterward. |
+
+## Drain boundary
+
+Only `full_mcp_restart` and `host_restart` set `full_drain_required=true`.
+Reconnects and configuration reloads do not disrupt peer sessions. Worker,
+role-runtime, and connector restarts evaluate only their explicitly named
+target. Rolling restart drains one instance at a time. Missing required target
+scope denies the request rather than silently widening it to a full restart.
+
+## Permission and approval boundary
+
+Author, reviewer, merger, and reconciler roles may self-request reconnects and
+request scoped worker/role/connector/reload recovery. They cannot request
+rolling, full, or host restart classes. Controller/operator/admin roles may
+request the broader classes, while execution remains operator/admin-owned.
+Controller approval is independently required for every class above a session
+reconnect. Host restart additionally requires infrastructure-operator proof.
+
+The MCP request tool derives class permissions from its authenticated runtime
+role. It does not accept caller-supplied permissions. Controller and operator
+authorization are read from the already-running daemon environment, never
+from a request argument.
+
+## Audit and failure behavior
+
+Every impact audit and every console restart/reload audit includes a
+`restart_class` field. The impact audit also includes the exact
+`required_permission`. Unknown classes, missing permissions, ineligible roles,
+missing approval, missing scoped targets, and incomplete inventory all deny
+fail closed. Manual process kills remain forbidden and contaminating (#630).

docs/mcp-restart-coordinator.md

@@ -12,6 +12,12 @@ restart/reload/kill paths). The **mutative apply** path — actually performing
 restart — is a later child gated by a drain proof and is explicitly out of
 scope here.
 
+The coordinator now routes every request through the restart-class policy
+matrix defined for #663. See
+[`mcp-restart-classes.md`](./mcp-restart-classes.md) for permissions, expected
+blast radius, scoped drain and approval requirements, audit fields, and
+recovery behavior for all nine classes.
+
 ## Components
 
 | Piece | Where | Responsibility |
@@ -77,7 +83,10 @@ authorization is present.
 ```text
 gitea_request_mcp_restart(remote, host, org, repo,
                           dry_run=True, request_override=False,
-                          session_id=None, limit=200)
+                          session_id=None, limit=200,
+                          restart_class="full_mcp_restart",
+                          target_session_id=None, target_role=None,
+                          target_connector=None)
 ```
 
 Read-only, dry-run, and it **never restarts anything**. `apply_supported` is
@@ -87,7 +96,8 @@ apply is gated by a drain proof (a separate child).
 ## Audit
 
 Every evaluation carries an `audit_record` (event, coordinator version, verdict,
-allow decision, blast radius, counts, timestamp) so restart decisions are
+restart class, required permission, allow decision, blast radius, counts,
+timestamp) so restart decisions are
 auditable. No secrets flow through the coordinator — session ids, pids, and
 profiles are operational metadata only.
 

docs/webui-local-dev.md

@@ -57,6 +57,8 @@ status, onboarding checklist state, and the fail-closed error payloads (#635).
 | `/system-health` | System-health dashboard — readiness, version/uptime, dependencies, MCP namespaces, stale-runtime parity (#639) |
 | `/queue` | Live PR and issue queue dashboard (#429) |
 | `/api/queue` | JSON queue export with pagination metadata |
+| `/traffic` | Workflow traffic-control view — runnable, leased, blocked, needs-controller, terminal-complete (#640) |
+| `/api/traffic` | JSON traffic-control export with state classifications and next safe role actions |
 | `/projects` | Project registry list with status and onboarding progress (#427, #635) |
 | `/projects/{id}` | Project detail + onboarding checklist |
 | `/api/v1/projects` | Versioned JSON registry export (#635) |
@@ -85,6 +87,35 @@ Most routes are GET-only. POST/PUT/PATCH/DELETE return `405` with
 `read-only-mvp`, except `/audit` and `/api/audit` which accept POST for
 local validator preview only (no Gitea mutations, no server-side storage).
 
+### Traffic-control state vocabulary (#640)
+
+The traffic view classifies each open issue/PR into exactly one bucket:
+
+| Bucket | Meaning | Operator implication |
+|--------|---------|----------------------|
+| **runnable** | No active lease, no block reason, safe for its expected role | Next role may start work |
+| **leased** | Active author claim or reviewer PR lease | Do not stomp; wait or adopt via role tools |
+| **blocked** | Dependency, missing head pin, conflict, or unmet dependency | Author remediation first |
+| **needs_controller** | Contaminated, controller-only diagnosis, or `status:blocked` | Controller only |
+| **terminal_complete** | Reconciler / terminal-lock territory | Reconciler cleanup path |
+
+`status:blocked` items route to **needs_controller**, not **blocked**:
+`expected_role_for_candidate` sends them to the controller, and the blocker
+reason renders in either bucket.
+
+**Live path contracts (do not invent):**
+
+- PR head pins come from `QueueItem.signals["head_sha"]` (full SHA). Display
+  `extra["head_sha"]` is truncated and must never be used for routing.
+- Reviewer leases are keyed as `(pr, pr_number)` only — never via a linked
+  `issue_number` on the same lease marker.
+- Issue claims come from `claim_inventory["entries"]`
+  (`issue_claim_heartbeat.build_claim_inventory`). There is no `active_claims`
+  key.
+- Queue display badges are only: `blocked`, `claimed`, `duplicate`, `stale`,
+  `in-review`, `open`. Review verdicts (`request-changes`, `approved`) are
+  **not** queue badges; traffic does not invent them from the queue loader.
+
 ## System health API (#634)
 
 `GET /api/v1/system/health` is the structured, read-only health surface for

gitea_mcp_server.py

@@ -22342,10 +22342,15 @@ def gitea_request_mcp_restart(
     request_override: bool = False,
     session_id: str | None = None,
     limit: int = 200,
+    restart_class: str = "full_mcp_restart",
+    target_session_id: str | None = None,
+    target_role: str | None = None,
+    target_connector: str | None = None,
 ) -> dict:
     """Evaluate a proposed MCP restart and return an impact preview (#658).
 
-    Central restart coordinator: gathers live control-plane state (sessions,
+    Central restart coordinator: resolves the requested restart class, gathers
+    live control-plane state (sessions,
     leases/locks, in-flight issue/PR work, mutations, worktrees) and returns a
     blast-radius impact report with a ``safe`` / ``unsafe`` / ``override``
     verdict, so the console (#642/#652) and operators can see what a restart
@@ -22439,6 +22444,9 @@ def gitea_request_mcp_restart(
 
     profile = get_profile()
     profile_name = (profile.get("profile_name") or "").strip() or "session"
+    requester_role = (
+        profile.get("role_kind") or profile.get("role") or ""
+    ).strip().lower()
     sid = (session_id or "").strip() or f"{profile_name}-{os.getpid()}"
 
     # Override authority is read from the environment only — a worker session
@@ -22448,6 +22456,15 @@ def gitea_request_mcp_restart(
         (os.environ.get("GITEA_OPERATOR_RESTART_OVERRIDE_AUTHORIZATION") or "").strip()
     )
     operator_override = bool(request_override and operator_authorized)
+    controller_approved = bool(
+        (
+            os.environ.get("GITEA_CONTROLLER_RESTART_APPROVAL_AUTHORIZATION")
+            or ""
+        ).strip()
+    )
+    requester_permissions = restart_coordinator.permissions_for_role(
+        requester_role
+    )
 
     inventory = {
         "sessions": sessions,
@@ -22462,6 +22479,14 @@ def gitea_request_mcp_restart(
         operator_override=operator_override,
         requesting_session_id=sid,
         dry_run=True,  # coordinator is always analysis-only (#658)
+        restart_class=restart_class,
+        requester_role=requester_role,
+        requester_permissions=requester_permissions,
+        controller_approved=controller_approved,
+        operator_authorized=operator_authorized,
+        target_session_id=target_session_id,
+        target_role=target_role,
+        target_connector=target_connector,
     )
 
     payload = report.as_dict()
@@ -22473,6 +22498,9 @@ def gitea_request_mcp_restart(
     payload["requesting_session_id"] = sid
     payload["operator_override_requested"] = bool(request_override)
     payload["operator_override_authorized"] = operator_authorized
+    payload["controller_approval_authorized"] = controller_approved
+    payload["requester_role"] = requester_role
+    payload["requester_permissions"] = list(requester_permissions)
     payload["apply_supported"] = False
     if not dry_run:
         payload["reasons"] = list(payload.get("reasons") or []) + [

restart_coordinator.py

@@ -28,11 +28,12 @@ from __future__ import annotations
 
 from dataclasses import dataclass, field
 from datetime import datetime, timezone
+from enum import Enum
 from typing import Any, Mapping, Sequence
 
 import lease_lifecycle
 
-COORDINATOR_VERSION = "1.0.0-issue-658"
+COORDINATOR_VERSION = "1.1.0-issue-663"
 
 # Restart verdicts. Exactly the three the acceptance criteria name.
 VERDICT_SAFE = "safe"
@@ -54,6 +55,194 @@ LEASE_FRESHNESS_LIVE = "active"
 DEFAULT_SESSION_HEARTBEAT_STALE_SECONDS = 900
 
 
+class RestartClass(str, Enum):
+    """The only restart/recovery classes accepted by the coordinator."""
+
+    CLIENT_RECONNECT = "client_reconnect"
+    SESSION_RECONNECT = "session_reconnect"
+    WORKER_RESTART = "worker_restart"
+    ROLE_RUNTIME_RESTART = "role_runtime_restart"
+    CONNECTOR_RESTART = "connector_restart"
+    CONFIGURATION_RELOAD = "configuration_reload"
+    ROLLING_MCP_RESTART = "rolling_mcp_restart"
+    FULL_MCP_RESTART = "full_mcp_restart"
+    HOST_RESTART = "host_restart"
+
+
+@dataclass(frozen=True)
+class RestartClassPolicy:
+    """Least-privilege policy for one :class:`RestartClass`."""
+
+    restart_class: RestartClass
+    required_permission: str
+    expected_blast_radius: str
+    drain_requirement: str
+    full_drain_required: bool
+    approval_requirement: str
+    audit_requirement: str
+    recovery_behavior: str
+    request_roles: tuple[str, ...]
+    execution_roles: tuple[str, ...]
+
+    def as_dict(self) -> dict[str, Any]:
+        return {
+            "restart_class": self.restart_class.value,
+            "required_permission": self.required_permission,
+            "expected_blast_radius": self.expected_blast_radius,
+            "drain_requirement": self.drain_requirement,
+            "full_drain_required": self.full_drain_required,
+            "approval_requirement": self.approval_requirement,
+            "audit_requirement": self.audit_requirement,
+            "recovery_behavior": self.recovery_behavior,
+            "request_roles": list(self.request_roles),
+            "execution_roles": list(self.execution_roles),
+        }
+
+
+WORKER_ROLES = ("author", "reviewer", "merger", "reconciler")
+CONTROL_ROLES = ("controller", "operator", "admin")
+ALL_REQUEST_ROLES = WORKER_ROLES + CONTROL_ROLES
+
+RESTART_CLASS_POLICIES: dict[RestartClass, RestartClassPolicy] = {
+    RestartClass.CLIENT_RECONNECT: RestartClassPolicy(
+        RestartClass.CLIENT_RECONNECT,
+        "mcp.reconnect.client",
+        BLAST_NONE,
+        "none",
+        False,
+        "self_service",
+        "record class, actor, client namespace, reason, and outcome",
+        "Reconnect only the caller's client transport; no daemon or peer session changes.",
+        ALL_REQUEST_ROLES,
+        ALL_REQUEST_ROLES,
+    ),
+    RestartClass.SESSION_RECONNECT: RestartClassPolicy(
+        RestartClass.SESSION_RECONNECT,
+        "mcp.reconnect.session",
+        BLAST_LOW,
+        "requesting_session_safe_point",
+        False,
+        "self_service",
+        "record class, actor, session id, reason, and outcome",
+        "Rebind identity, capability, and workspace state for one session.",
+        ALL_REQUEST_ROLES,
+        ALL_REQUEST_ROLES,
+    ),
+    RestartClass.WORKER_RESTART: RestartClassPolicy(
+        RestartClass.WORKER_RESTART,
+        "mcp.restart.worker.request",
+        BLAST_LOW,
+        "target_worker",
+        False,
+        "controller_approval_and_automated_gates",
+        "record class, actor, target worker, approval, drain proof, and outcome",
+        "Restart one worker after its own lease and mutation scope is drained.",
+        ALL_REQUEST_ROLES,
+        ("operator", "admin"),
+    ),
+    RestartClass.ROLE_RUNTIME_RESTART: RestartClassPolicy(
+        RestartClass.ROLE_RUNTIME_RESTART,
+        "mcp.restart.role_runtime.request",
+        BLAST_MEDIUM,
+        "target_role_runtime",
+        False,
+        "controller_approval_and_automated_gates",
+        "record class, actor, role namespace, approval, drain proof, and outcome",
+        "Restart only the selected role runtime and then re-probe that namespace.",
+        ALL_REQUEST_ROLES,
+        ("operator", "admin"),
+    ),
+    RestartClass.CONNECTOR_RESTART: RestartClassPolicy(
+        RestartClass.CONNECTOR_RESTART,
+        "mcp.restart.connector.request",
+        BLAST_MEDIUM,
+        "target_connector",
+        False,
+        "controller_approval_and_automated_gates",
+        "record class, actor, connector id, approval, drain proof, and outcome",
+        "Restart one connector while unrelated role runtimes remain available.",
+        ALL_REQUEST_ROLES,
+        ("operator", "admin"),
+    ),
+    RestartClass.CONFIGURATION_RELOAD: RestartClassPolicy(
+        RestartClass.CONFIGURATION_RELOAD,
+        "mcp.reload.configuration.request",
+        BLAST_LOW,
+        "mutation_quiesce",
+        False,
+        "controller_approval_and_automated_gates",
+        "record class, actor, configuration revision, approval, and outcome",
+        "Gracefully reload configuration without replacing the daemon process.",
+        ALL_REQUEST_ROLES,
+        ("operator", "admin"),
+    ),
+    RestartClass.ROLLING_MCP_RESTART: RestartClassPolicy(
+        RestartClass.ROLLING_MCP_RESTART,
+        "mcp.restart.rolling.request",
+        BLAST_MEDIUM,
+        "one_instance_at_a_time",
+        False,
+        "controller_approval_and_automated_gates",
+        "record class, actor, instance order, approval, per-instance drains, and outcome",
+        "Drain, restart, verify, and restore one instance before advancing to the next.",
+        CONTROL_ROLES,
+        ("operator", "admin"),
+    ),
+    RestartClass.FULL_MCP_RESTART: RestartClassPolicy(
+        RestartClass.FULL_MCP_RESTART,
+        "mcp.restart.full.request",
+        BLAST_HIGH,
+        "all_sessions_and_mutations",
+        True,
+        "controller_approval_and_automated_gates",
+        "record class, actor, full impact report, approval, drain proof, and outcome",
+        "Stop and restore the complete MCP runtime only after a verified full drain.",
+        CONTROL_ROLES,
+        ("operator", "admin"),
+    ),
+    RestartClass.HOST_RESTART: RestartClassPolicy(
+        RestartClass.HOST_RESTART,
+        "mcp.restart.host.request",
+        BLAST_HIGH,
+        "all_host_work",
+        True,
+        "controller_approval_plus_infrastructure_operator",
+        "record class, actor, host, incident or change id, approval, drain proof, and outcome",
+        "Hand off to infrastructure ownership; reconcile every runtime after the host returns.",
+        ("controller", "operator", "admin"),
+        ("operator", "admin"),
+    ),
+}
+
+
+def resolve_restart_class(value: RestartClass | str) -> RestartClass:
+    """Resolve a restart class or fail closed for an unknown value."""
+
+    if isinstance(value, RestartClass):
+        return value
+    try:
+        return RestartClass(str(value).strip())
+    except ValueError as exc:
+        raise ValueError(f"unknown restart class {value!r}; deny (fail closed)") from exc
+
+
+def restart_class_policy(value: RestartClass | str) -> RestartClassPolicy:
+    """Return the canonical policy for *value*."""
+
+    return RESTART_CLASS_POLICIES[resolve_restart_class(value)]
+
+
+def permissions_for_role(role: str | None) -> tuple[str, ...]:
+    """Return request permissions granted to a workflow role by this policy."""
+
+    normalized = str(role or "").strip().lower()
+    return tuple(
+        policy.required_permission
+        for policy in RESTART_CLASS_POLICIES.values()
+        if normalized in policy.request_roles
+    )
+
+
 def _utc_now() -> datetime:
     return datetime.now(timezone.utc)
 
@@ -75,6 +264,7 @@ class SessionImpact:
     heartbeat_stale: bool
     is_requester: bool
     live: bool
+    connector: str | None = None
 
     def as_dict(self) -> dict[str, Any]:
         return {
@@ -87,6 +277,7 @@ class SessionImpact:
             "heartbeat_stale": self.heartbeat_stale,
             "is_requester": self.is_requester,
             "live": self.live,
+            "connector": self.connector,
         }
 
 
@@ -105,6 +296,7 @@ class LeaseImpact:
     disruptive: bool
     is_mutation: bool
     is_critical_section: bool
+    connector: str | None = None
 
     def as_dict(self) -> dict[str, Any]:
         return {
@@ -119,6 +311,7 @@ class LeaseImpact:
             "disruptive": self.disruptive,
             "is_mutation": self.is_mutation,
             "is_critical_section": self.is_critical_section,
+            "connector": self.connector,
         }
 
 
@@ -127,6 +320,13 @@ class RestartImpactReport:
     """Impact preview DTO returned to the console / operator (#642/#652)."""
 
     coordinator_version: str
+    restart_class: str
+    restart_policy: dict[str, Any]
+    policy_enforced: bool
+    permission_authorized: bool
+    role_authorized: bool
+    approval_satisfied: bool
+    authorization_reasons: list[str]
     evaluated_at: str
     dry_run: bool
     restart_performed: bool
@@ -153,6 +353,13 @@ class RestartImpactReport:
     def as_dict(self) -> dict[str, Any]:
         return {
             "coordinator_version": self.coordinator_version,
+            "restart_class": self.restart_class,
+            "restart_policy": dict(self.restart_policy),
+            "policy_enforced": self.policy_enforced,
+            "permission_authorized": self.permission_authorized,
+            "role_authorized": self.role_authorized,
+            "approval_satisfied": self.approval_satisfied,
+            "authorization_reasons": list(self.authorization_reasons),
             "evaluated_at": self.evaluated_at,
             "dry_run": self.dry_run,
             "restart_performed": self.restart_performed,
@@ -206,6 +413,7 @@ def _classify_session(
             requesting_session_id and session_id == requesting_session_id
         ),
         live=live,
+        connector=(str(row.get("connector") or "").strip() or None),
     )
 
 
@@ -258,6 +466,7 @@ def _classify_lease(row: Mapping[str, Any]) -> LeaseImpact:
         disruptive=disruptive,
         is_mutation=is_mutation,
         is_critical_section=disruptive,
+        connector=(str(row.get("connector") or "").strip() or None),
     )
 
 
@@ -279,6 +488,14 @@ def evaluate_restart_impact(
     requesting_session_id: str | None = None,
     dry_run: bool = True,
     session_heartbeat_stale_seconds: int = DEFAULT_SESSION_HEARTBEAT_STALE_SECONDS,
+    restart_class: RestartClass | str | None = None,
+    requester_role: str | None = None,
+    requester_permissions: Sequence[str] | None = None,
+    controller_approved: bool = False,
+    operator_authorized: bool = False,
+    target_session_id: str | None = None,
+    target_role: str | None = None,
+    target_connector: str | None = None,
 ) -> RestartImpactReport:
     """Evaluate a proposed MCP restart and return an impact preview.
 
@@ -301,6 +518,61 @@ def evaluate_restart_impact(
     """
     moment = now or _utc_now()
     reasons: list[str] = []
+    authorization_reasons: list[str] = []
+
+    # ``None`` preserves the pre-#663 impact-only API for callers that have not
+    # yet been migrated. All MCP requests pass an explicit class and therefore
+    # take the fail-closed policy path.
+    policy_enforced = restart_class is not None
+    try:
+        resolved_class = resolve_restart_class(
+            restart_class or RestartClass.FULL_MCP_RESTART
+        )
+        policy = RESTART_CLASS_POLICIES[resolved_class]
+        unknown_class = False
+    except ValueError as exc:
+        resolved_class = None
+        policy = None
+        unknown_class = True
+        authorization_reasons.append(str(exc))
+
+    normalized_role = str(requester_role or "").strip().lower()
+    granted = {str(p).strip() for p in (requester_permissions or ())}
+    if policy_enforced and policy is not None:
+        permission_authorized = policy.required_permission in granted
+        role_authorized = normalized_role in policy.request_roles
+        if not permission_authorized:
+            authorization_reasons.append(
+                f"missing required permission {policy.required_permission!r}"
+            )
+        if not role_authorized:
+            authorization_reasons.append(
+                f"role {normalized_role or 'unknown'!r} may not request "
+                f"{policy.restart_class.value}"
+            )
+    elif unknown_class:
+        permission_authorized = False
+        role_authorized = False
+    else:
+        permission_authorized = True
+        role_authorized = True
+
+    if policy_enforced and policy is not None:
+        approval = policy.approval_requirement
+        if approval == "self_service":
+            approval_satisfied = True
+        elif approval == "controller_approval_plus_infrastructure_operator":
+            approval_satisfied = bool(controller_approved and operator_authorized)
+        else:
+            approval_satisfied = bool(controller_approved)
+        if not approval_satisfied:
+            authorization_reasons.append(
+                f"approval requirement not satisfied: {approval}"
+            )
+    elif unknown_class:
+        approval_satisfied = False
+    else:
+        approval_satisfied = True
 
     inventory_complete = bool(inventory.get("inventory_complete", False))
     incomplete_reasons = [str(r) for r in (inventory.get("incomplete_reasons") or [])]
@@ -323,15 +595,67 @@ def evaluate_restart_impact(
     ]
     lease_impacts = [_classify_lease(l) for l in leases_raw]
 
-    # Only *other* live sessions and live leases constitute blast radius: a
+    # Route impact through the selected class. Narrow classes never inherit a
-    # restart that would kill only the requesting session with no other work in
+    # full-runtime drain merely because unrelated work exists.
-    # flight is safe.
+    target_complete = True
+    if resolved_class in {
+        RestartClass.CLIENT_RECONNECT,
+        RestartClass.SESSION_RECONNECT,
+        RestartClass.CONFIGURATION_RELOAD,
+    }:
+        scoped_sessions: list[SessionImpact] = []
+        scoped_leases: list[LeaseImpact] = []
+    elif resolved_class == RestartClass.WORKER_RESTART:
+        selected_session = (target_session_id or "").strip()
+        target_complete = bool(selected_session)
+        scoped_sessions = [
+            s for s in session_impacts if s.session_id == selected_session
+        ]
+        scoped_leases = [
+            l for l in lease_impacts if l.session_id == selected_session
+        ]
+    elif resolved_class == RestartClass.ROLE_RUNTIME_RESTART:
+        selected_role = (target_role or "").strip().lower()
+        target_complete = bool(selected_role)
+        scoped_sessions = [
+            s for s in session_impacts if str(s.role or "").lower() == selected_role
+        ]
+        scoped_leases = [
+            l for l in lease_impacts if str(l.role or "").lower() == selected_role
+        ]
+    elif resolved_class == RestartClass.CONNECTOR_RESTART:
+        selected_connector = (target_connector or "").strip()
+        target_complete = bool(selected_connector)
+        scoped_sessions = [
+            s for s in session_impacts if s.connector == selected_connector
+        ]
+        scoped_leases = [
+            l for l in lease_impacts if l.connector == selected_connector
+        ]
+    else:
+        scoped_sessions = list(session_impacts)
+        scoped_leases = list(lease_impacts)
+
+    if policy_enforced and not target_complete:
+        authorization_reasons.append(
+            f"target required for {resolved_class.value if resolved_class else 'unknown class'}"
+        )
+
     other_live_sessions = [
-        s for s in session_impacts if s.live and not s.is_requester
+        s for s in scoped_sessions if s.live and not s.is_requester
     ]
-    disruptive_leases = [l for l in lease_impacts if l.disruptive]
+    disruptive_leases = [l for l in scoped_leases if l.disruptive]
-    critical_sections = [l for l in lease_impacts if l.is_critical_section]
+    critical_sections = [l for l in scoped_leases if l.is_critical_section]
-    mutations = [l for l in lease_impacts if l.is_mutation]
+    mutations = [l for l in scoped_leases if l.is_mutation]
+    terminal_lock_in_scope = (
+        terminal_lock
+        if resolved_class
+        not in {
+            RestartClass.CLIENT_RECONNECT,
+            RestartClass.SESSION_RECONNECT,
+        }
+        else None
+    )
 
     affected_issues = sorted(
         {
@@ -348,9 +672,24 @@ def evaluate_restart_impact(
         }
     )
 
-    disruptive = bool(disruptive_leases or other_live_sessions or terminal_lock)
+    disruptive = bool(
+        disruptive_leases or other_live_sessions or terminal_lock_in_scope
+    )
 
-    if not inventory_complete:
+    authorization_ok = bool(
+        not unknown_class
+        and permission_authorized
+        and role_authorized
+        and approval_satisfied
+        and target_complete
+    )
+
+    if policy_enforced and not authorization_ok:
+        verdict = VERDICT_UNSAFE
+        allow_restart = False
+        reasons.append("restart class authorization denied (fail closed)")
+        reasons.extend(authorization_reasons)
+    elif not inventory_complete:
         verdict = VERDICT_UNSAFE
         allow_restart = False
         reasons.append(
@@ -381,7 +720,7 @@ def evaluate_restart_impact(
             f"{len(critical_sections)} critical section(s) in flight "
             "(active lease with a live owner)"
         )
-    if terminal_lock:
+    if terminal_lock_in_scope:
         reasons.append("active terminal (merge) lock present")
 
     override_would_allow = bool(inventory_complete and disruptive)
@@ -411,6 +750,12 @@ def evaluate_restart_impact(
     audit_record = {
         "event": "restart_impact_evaluated",
         "coordinator_version": COORDINATOR_VERSION,
+        "restart_class": (
+            resolved_class.value if resolved_class else str(restart_class or "")
+        ),
+        "required_permission": (
+            policy.required_permission if policy is not None else None
+        ),
         "evaluated_at": moment.isoformat(),
         "dry_run": dry_run,
         "operator_override": bool(operator_override),
@@ -424,6 +769,15 @@ def evaluate_restart_impact(
 
     return RestartImpactReport(
         coordinator_version=COORDINATOR_VERSION,
+        restart_class=(
+            resolved_class.value if resolved_class else str(restart_class or "")
+        ),
+        restart_policy=policy.as_dict() if policy is not None else {},
+        policy_enforced=policy_enforced,
+        permission_authorized=permission_authorized,
+        role_authorized=role_authorized,
+        approval_satisfied=approval_satisfied,
+        authorization_reasons=authorization_reasons,
         evaluated_at=moment.isoformat(),
         dry_run=dry_run,
         restart_performed=False,
@@ -440,9 +794,11 @@ def evaluate_restart_impact(
         affected_issues=affected_issues,
         affected_prs=affected_prs,
         mutations=mutations,
-        terminal_lock=dict(terminal_lock)
+        terminal_lock=(
-        if isinstance(terminal_lock, Mapping)
+            dict(terminal_lock_in_scope)
-        else terminal_lock,
+            if isinstance(terminal_lock_in_scope, Mapping)
+            else terminal_lock_in_scope
+        ),
         ack_state=ack_state,
         prior_recovery_attempts=prior_recovery_attempts,
         counts=counts,

tests/test_restart_classes.py

@@ -0,0 +1,232 @@
+"""Permission, drain, routing, and audit matrix for restart classes (#663)."""
+
+from __future__ import annotations
+
+import os
+from datetime import datetime, timezone
+
+import restart_coordinator as rc
+
+NOW = datetime(2026, 7, 24, 20, 0, tzinfo=timezone.utc)
+
+
+def _inventory() -> dict:
+    return {
+        "inventory_complete": True,
+        "sessions": [
+            {
+                "session_id": "requester",
+                "role": "author",
+                "profile": "prgs-author",
+                "pid": os.getpid(),
+                "status": "active",
+                "last_heartbeat_at": NOW.isoformat(),
+            },
+            {
+                "session_id": "reviewer",
+                "role": "reviewer",
+                "profile": "prgs-reviewer",
+                "pid": os.getpid(),
+                "status": "active",
+                "last_heartbeat_at": NOW.isoformat(),
+            },
+        ],
+        "leases": [
+            {
+                "lease_id": "review-lease",
+                "session_id": "reviewer",
+                "role": "reviewer",
+                "phase": "reviewing",
+                "work_kind": "pr",
+                "work_number": 900,
+                "worktree_path": "/tmp/review-900",
+                "freshness": {"freshness": "active"},
+            }
+        ],
+    }
+
+
+def _evaluate(
+    restart_class: rc.RestartClass,
+    *,
+    role: str = "controller",
+    permissions: tuple[str, ...] | None = None,
+    approved: bool = True,
+    operator: bool = True,
+    **targets,
+):
+    return rc.evaluate_restart_impact(
+        _inventory(),
+        now=NOW,
+        requesting_session_id="requester",
+        restart_class=restart_class,
+        requester_role=role,
+        requester_permissions=(
+            permissions if permissions is not None
+            else rc.permissions_for_role(role)
+        ),
+        controller_approved=approved,
+        operator_authorized=operator,
+        **targets,
+    )
+
+
+def test_policy_table_covers_exactly_all_nine_classes():
+    assert set(rc.RESTART_CLASS_POLICIES) == set(rc.RestartClass)
+    assert len(rc.RESTART_CLASS_POLICIES) == 9
+    for restart_class, policy in rc.RESTART_CLASS_POLICIES.items():
+        assert policy.restart_class is restart_class
+        assert policy.required_permission
+        assert policy.expected_blast_radius in {
+            rc.BLAST_NONE, rc.BLAST_LOW, rc.BLAST_MEDIUM, rc.BLAST_HIGH
+        }
+        assert policy.drain_requirement
+        assert policy.approval_requirement
+        assert policy.audit_requirement
+        assert policy.recovery_behavior
+
+
+def test_permission_matrix_allows_each_class_with_exact_permission():
+    targets = {
+        rc.RestartClass.WORKER_RESTART: {"target_session_id": "reviewer"},
+        rc.RestartClass.ROLE_RUNTIME_RESTART: {"target_role": "reviewer"},
+        rc.RestartClass.CONNECTOR_RESTART: {"target_connector": "github"},
+    }
+    for restart_class, policy in rc.RESTART_CLASS_POLICIES.items():
+        report = _evaluate(
+            restart_class,
+            permissions=(policy.required_permission,),
+            **targets.get(restart_class, {}),
+        )
+        assert report.permission_authorized, restart_class
+        assert report.role_authorized, restart_class
+        assert report.approval_satisfied, restart_class
+        assert report.audit_record["restart_class"] == restart_class.value
+        assert (
+            report.audit_record["required_permission"]
+            == policy.required_permission
+        )
+
+
+def test_missing_or_nearby_permission_denies():
+    report = _evaluate(
+        rc.RestartClass.ROLE_RUNTIME_RESTART,
+        permissions=("mcp.restart.worker.request",),
+        target_role="reviewer",
+    )
+    assert report.verdict == rc.VERDICT_UNSAFE
+    assert not report.allow_restart
+    assert not report.permission_authorized
+    assert any("missing required permission" in r for r in report.reasons)
+
+
+def test_unknown_restart_class_denies_fail_closed():
+    report = rc.evaluate_restart_impact(
+        _inventory(),
+        now=NOW,
+        restart_class="surprise_reboot",
+        requester_role="admin",
+        requester_permissions=("mcp.restart.host.request",),
+        controller_approved=True,
+        operator_authorized=True,
+    )
+    assert report.verdict == rc.VERDICT_UNSAFE
+    assert not report.allow_restart
+    assert report.restart_policy == {}
+    assert any("unknown restart class" in r for r in report.reasons)
+
+
+def test_worker_roles_cannot_request_full_or_host_restart():
+    for role in rc.WORKER_ROLES:
+        granted = rc.permissions_for_role(role)
+        assert "mcp.restart.full.request" not in granted
+        assert "mcp.restart.host.request" not in granted
+        report = _evaluate(
+            rc.RestartClass.FULL_MCP_RESTART,
+            role=role,
+            permissions=granted,
+        )
+        assert not report.role_authorized
+        assert not report.allow_restart
+
+
+def test_controller_approval_is_independent_of_permission():
+    report = _evaluate(
+        rc.RestartClass.WORKER_RESTART,
+        approved=False,
+        target_session_id="reviewer",
+    )
+    assert report.permission_authorized
+    assert not report.approval_satisfied
+    assert not report.allow_restart
+
+
+def test_narrow_classes_do_not_inherit_full_drain_or_peer_lease_block():
+    for restart_class in (
+        rc.RestartClass.CLIENT_RECONNECT,
+        rc.RestartClass.SESSION_RECONNECT,
+        rc.RestartClass.CONFIGURATION_RELOAD,
+    ):
+        report = _evaluate(restart_class)
+        assert not report.restart_policy["full_drain_required"]
+        assert report.counts["leases_disruptive"] == 0
+        assert report.counts["sessions_live_other"] == 0
+        assert report.counts["critical_sections"] == 0
+        assert report.counts["mutations"] == 0
+        assert report.allow_restart, (restart_class, report.reasons)
+
+
+def test_client_reconnect_does_not_wait_for_unrelated_terminal_lock():
+    inventory = _inventory()
+    inventory["terminal_lock"] = {"terminal_pr": 901}
+    report = rc.evaluate_restart_impact(
+        inventory,
+        now=NOW,
+        requesting_session_id="requester",
+        restart_class=rc.RestartClass.CLIENT_RECONNECT,
+        requester_role="author",
+        requester_permissions=rc.permissions_for_role("author"),
+    )
+    assert report.allow_restart
+    assert report.terminal_lock is None
+
+
+def test_scoped_restart_only_counts_named_target():
+    report = _evaluate(
+        rc.RestartClass.ROLE_RUNTIME_RESTART,
+        target_role="author",
+    )
+    assert report.counts["leases_disruptive"] == 0
+    assert report.affected_prs == []
+    assert report.allow_restart
+
+    reviewer = _evaluate(
+        rc.RestartClass.ROLE_RUNTIME_RESTART,
+        target_role="reviewer",
+    )
+    assert reviewer.counts["leases_disruptive"] == 1
+    assert reviewer.affected_prs == [900]
+    assert not reviewer.allow_restart
+
+
+def test_missing_scoped_target_denies_instead_of_widening():
+    for restart_class in (
+        rc.RestartClass.WORKER_RESTART,
+        rc.RestartClass.ROLE_RUNTIME_RESTART,
+        rc.RestartClass.CONNECTOR_RESTART,
+    ):
+        report = _evaluate(restart_class)
+        assert not report.allow_restart
+        assert any("target required" in r for r in report.reasons)
+
+
+def test_only_full_and_host_classes_require_full_drain():
+    requiring_full = {
+        restart_class
+        for restart_class, policy in rc.RESTART_CLASS_POLICIES.items()
+        if policy.full_drain_required
+    }
+    assert requiring_full == {
+        rc.RestartClass.FULL_MCP_RESTART,
+        rc.RestartClass.HOST_RESTART,
+    }

tests/test_webui_sanctioned_restart.py

@@ -444,6 +444,12 @@ class TestAuditEmission(unittest.TestCase):
         )
         self.assertEqual(record["target"]["namespace"], NAMESPACE)
         self.assertEqual(record["target"]["mode"], "restart")
+        self.assertEqual(
+            record["target"]["restart_class"], "role_runtime_restart"
+        )
+        self.assertEqual(
+            record["metadata"]["restart_class"], "role_runtime_restart"
+        )
         self.assertEqual(record["result"], console_audit.RESULT_ALLOWED)
         self.assertEqual(record["actor"]["subject"], "[email protected]")
         self.assertFalse(record["metadata"]["process_kill_executed"])

tests/test_webui_traffic_control.py

@@ -0,0 +1,408 @@
+"""Tests for web UI workflow traffic-control view (#640)."""
+
+import sys
+import unittest
+from pathlib import Path
+from unittest import mock
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from starlette.testclient import TestClient
+
+from webui.app import create_app
+from webui.traffic_loader import (
+    TrafficItem,
+    TrafficSnapshot,
+    load_traffic_snapshot,
+    snapshot_to_dict,
+)
+from webui.traffic_views import render_traffic_page
+from allocator_service import WorkCandidate
+
+
+class TestTrafficClassification(unittest.TestCase):
+    def test_runnable_candidate_classification(self):
+        cand = WorkCandidate(
+            kind="issue",
+            number=640,
+            state="open",
+            labels=("status:ready",),
+            title="Web Console: Workflow traffic-control view (Phase 1)",
+            priority=20,
+        )
+        snap = load_traffic_snapshot(candidates=[cand])
+        self.assertEqual(len(snap.runnable), 1)
+        self.assertEqual(snap.runnable[0].number, 640)
+        self.assertTrue(snap.runnable[0].is_safe)
+        self.assertEqual(snap.runnable[0].traffic_state, "runnable")
+
+    def test_blocked_dependency_candidate_classification(self):
+        cand = WorkCandidate(
+            kind="issue",
+            number=643,
+            state="open",
+            labels=("status:ready",),
+            title="Web Console: Requests & intent preview (Phase 2)",
+            priority=20,
+            dependency_unmet=True,
+            dependency_reason="issue#643 depends on unresolved issue(s) #640; they are not closed",
+        )
+        snap = load_traffic_snapshot(candidates=[cand])
+        self.assertEqual(len(snap.blocked), 1)
+        self.assertEqual(snap.blocked[0].number, 643)
+        self.assertFalse(snap.blocked[0].is_safe)
+        self.assertEqual(snap.blocked[0].traffic_state, "blocked")
+        self.assertIn("depends on unresolved issue(s) #640", snap.blocked[0].block_reason)
+
+    def test_leased_candidate_classification(self):
+        cand = WorkCandidate(
+            kind="issue",
+            number=640,
+            state="open",
+            labels=("status:in-progress",),
+            title="Web Console: Workflow traffic-control view (Phase 1)",
+            priority=20,
+        )
+        lease = {
+            "kind": "issue",
+            "number": 640,
+            "session_id": "prgs-author-12345",
+            "role": "author",
+            "status": "active",
+        }
+        snap = load_traffic_snapshot(candidates=[cand], leases=[lease])
+        self.assertEqual(len(snap.leased), 1)
+        self.assertEqual(snap.leased[0].number, 640)
+        self.assertEqual(snap.leased[0].traffic_state, "leased")
+        self.assertIsNotNone(snap.leased[0].lease_info)
+
+    def test_needs_controller_candidate_classification(self):
+        cand = WorkCandidate(
+            kind="issue",
+            number=700,
+            state="open",
+            labels=("status:blocked",),
+            title="Controller intervention needed",
+            priority=10,
+            blocked=True,
+        )
+        snap = load_traffic_snapshot(candidates=[cand])
+        self.assertEqual(len(snap.needs_controller), 1)
+        self.assertEqual(snap.needs_controller[0].number, 700)
+
+
+class TestTrafficLoader(unittest.TestCase):
+    def test_snapshot_to_dict_export(self):
+        cand = WorkCandidate(
+            kind="issue",
+            number=640,
+            state="open",
+            labels=("status:ready",),
+            title="Traffic control test",
+            priority=20,
+        )
+        snap = load_traffic_snapshot(candidates=[cand])
+        data = snapshot_to_dict(snap)
+        self.assertEqual(data["project_id"], "gitea-tools")
+        self.assertEqual(len(data["runnable"]), 1)
+        self.assertTrue(data["inventory_complete"])
+
+    def test_fail_closed_error_handling(self):
+        with mock.patch("webui.traffic_loader.load_queue_snapshot", side_effect=RuntimeError("Gitea connection failed")):
+            snap = load_traffic_snapshot()
+        self.assertIsNotNone(snap.fetch_error)
+        self.assertIn("Failed to load traffic state", snap.fetch_error)
+        self.assertEqual(len(snap.runnable), 0)
+        self.assertFalse(snap.inventory_complete)
+
+
+class TestTrafficLivePath(unittest.TestCase):
+    """Live path tests: inject QueueSnapshot + LeaseSnapshot (no candidates=).
+
+    Covers the production ``load_traffic_snapshot()`` branch that ``/traffic``
+    and ``/api/traffic`` actually execute (#640 B1–B5).
+    """
+
+    FULL_SHA = "069a9af7e6aa2c2994e07199d1b0814819457017"
+
+    def _queue(
+        self,
+        *,
+        prs=(),
+        issues=(),
+    ):
+        from webui.queue_loader import QueueSnapshot
+
+        return QueueSnapshot(
+            project_id="gitea-tools",
+            repo_label="Scaled-Tech-Consulting/Gitea-Tools",
+            prs=tuple(prs),
+            issues=tuple(issues),
+            pr_pagination=None,
+            issue_pagination=None,
+            fetch_error=None,
+        )
+
+    def _lease(
+        self,
+        *,
+        claim_inventory=None,
+        reviewer_leases=(),
+    ):
+        from webui.lease_loader import LeaseSnapshot
+
+        return LeaseSnapshot(
+            project_id="gitea-tools",
+            repo_label="Scaled-Tech-Consulting/Gitea-Tools",
+            issue_lock=None,
+            claim_inventory=claim_inventory or {"entries": [], "counts": {}},
+            reviewer_leases=tuple(reviewer_leases),
+            duplicate_prs=(),
+            duplicate_branches=(),
+            collision_history=(),
+            fetch_error=None,
+        )
+
+    def test_live_pr_uses_full_head_sha_and_is_runnable(self):
+        from webui.queue_loader import QueueItem
+
+        pr = QueueItem(
+            number=885,
+            title="traffic control",
+            badges=("in-review",),
+            extra={"head_sha": self.FULL_SHA[:12], "linked_issue": "640"},
+            signals={
+                "head_sha": self.FULL_SHA,
+                "mergeable": True,
+                "labels": (),
+                "linked_issue": 640,
+            },
+        )
+        q = self._queue(prs=[pr])
+        l = self._lease()
+        snap = load_traffic_snapshot(
+            fetch_queue_snapshot=lambda: q,
+            fetch_lease_snapshot=lambda: l,
+        )
+        self.assertIsNone(snap.fetch_error)
+        self.assertEqual(len(snap.runnable), 1)
+        item = snap.runnable[0]
+        self.assertEqual(item.kind, "pr")
+        self.assertEqual(item.number, 885)
+        self.assertEqual(item.head_sha, self.FULL_SHA)
+        self.assertNotEqual(item.head_sha, self.FULL_SHA[:12])
+        self.assertIsNone(item.block_reason)
+        self.assertEqual(len(snap.blocked), 0)
+
+    def test_live_pr_without_head_sha_is_blocked(self):
+        from webui.queue_loader import QueueItem
+
+        pr = QueueItem(
+            number=1,
+            title="missing pin",
+            badges=("open",),
+            extra={"head_sha": ""},
+            signals={"head_sha": "", "mergeable": True, "labels": ()},
+        )
+        snap = load_traffic_snapshot(
+            fetch_queue_snapshot=lambda: self._queue(prs=[pr]),
+            fetch_lease_snapshot=lambda: self._lease(),
+        )
+        self.assertEqual(len(snap.blocked) + len(snap.needs_controller), 1)
+        item = (snap.blocked or snap.needs_controller)[0]
+        self.assertIn("missing head_sha", (item.block_reason or "").lower())
+
+    def test_reviewer_lease_keys_by_pr_not_linked_issue(self):
+        from webui.queue_loader import QueueItem
+
+        pr = QueueItem(
+            number=885,
+            title="leased pr",
+            badges=("in-review",),
+            extra={"head_sha": self.FULL_SHA[:12]},
+            signals={"head_sha": self.FULL_SHA, "mergeable": True, "labels": ()},
+        )
+        issue = QueueItem(
+            number=640,
+            title="linked issue",
+            badges=("open",),
+            extra={},
+            signals={"labels": ()},
+        )
+        # Marker-shaped record: has both pr_number and issue_number; must
+        # attach to the PR only (B2).
+        reviewer_lease = {
+            "pr_number": 885,
+            "issue_number": 640,
+            "phase": "validating",
+            "reviewer_identity": "sysadmin",
+            "session_id": "review-sess-1",
+        }
+        snap = load_traffic_snapshot(
+            fetch_queue_snapshot=lambda: self._queue(prs=[pr], issues=[issue]),
+            fetch_lease_snapshot=lambda: self._lease(reviewer_leases=[reviewer_lease]),
+        )
+        leased_prs = [i for i in snap.leased if i.kind == "pr" and i.number == 885]
+        self.assertEqual(len(leased_prs), 1)
+        self.assertEqual(leased_prs[0].lease_info.get("pr_number"), 885)
+        # Issue 640 must not inherit the reviewer lease just because issue_number
+        # is present on the marker.
+        for item in list(snap.leased) + list(snap.runnable) + list(snap.blocked):
+            if item.kind == "issue" and item.number == 640:
+                self.assertIsNone(
+                    item.lease_info,
+                    "reviewer lease must not attach to linked issue #640",
+                )
+                break
+        else:
+            self.fail("expected issue #640 in traffic snapshot")
+
+    def test_claim_inventory_entries_key_marks_issue_leased(self):
+        from webui.queue_loader import QueueItem
+
+        issue = QueueItem(
+            number=640,
+            title="claimed issue",
+            badges=("claimed",),
+            extra={},
+            signals={"labels": ("status:in-progress",)},
+        )
+        inventory = {
+            "entries": [
+                {
+                    "issue_number": 640,
+                    "status": "active",
+                    "latest_heartbeat": {"session_id": "author-sess-9"},
+                    "reasons": ["claim has structured heartbeat proof"],
+                }
+            ],
+            "counts": {"active": 1},
+            "in_progress_total": 1,
+        }
+        snap = load_traffic_snapshot(
+            fetch_queue_snapshot=lambda: self._queue(issues=[issue]),
+            fetch_lease_snapshot=lambda: self._lease(claim_inventory=inventory),
+        )
+        leased_issues = [i for i in snap.leased if i.kind == "issue" and i.number == 640]
+        self.assertEqual(len(leased_issues), 1)
+        self.assertEqual(leased_issues[0].traffic_state, "leased")
+
+    def test_active_claims_key_is_ignored(self):
+        """B3 regression: fictional ``active_claims`` must not create lease_info."""
+        from webui.queue_loader import QueueItem
+
+        issue = QueueItem(
+            number=640,
+            title="open issue",
+            badges=("open",),
+            extra={},
+            signals={"labels": ()},
+        )
+        # Only the broken key — must NOT produce lease_info. Entries-less
+        # inventory is empty (entries is the real claim_inventory key).
+        inventory = {
+            "active_claims": [
+                {
+                    "kind": "issue",
+                    "number": 640,
+                    "issue_number": 640,
+                    "status": "active",
+                },
+            ],
+            "counts": {},
+        }
+        snap = load_traffic_snapshot(
+            fetch_queue_snapshot=lambda: self._queue(issues=[issue]),
+            fetch_lease_snapshot=lambda: self._lease(claim_inventory=inventory),
+        )
+        items = [
+            i
+            for i in (
+                list(snap.runnable)
+                + list(snap.leased)
+                + list(snap.blocked)
+                + list(snap.needs_controller)
+            )
+            if i.kind == "issue" and i.number == 640
+        ]
+        self.assertEqual(len(items), 1)
+        self.assertIsNone(
+            items[0].lease_info,
+            "active_claims is not a real inventory key; entries-only",
+        )
+
+
+class TestTrafficRoutesAndRendering(unittest.TestCase):
+    def setUp(self):
+        self.client = TestClient(create_app())
+
+    def test_traffic_html_page_rendering(self):
+        cand1 = WorkCandidate(
+            kind="issue",
+            number=640,
+            state="open",
+            labels=("status:ready",),
+            title="Traffic View Implementation",
+            priority=20,
+        )
+        cand2 = WorkCandidate(
+            kind="issue",
+            number=643,
+            state="open",
+            labels=("status:ready",),
+            title="Dependent Feature",
+            priority=20,
+            dependency_unmet=True,
+            dependency_reason="issue#643 depends on unresolved issue(s) #640; they are not closed",
+        )
+        snap = load_traffic_snapshot(candidates=[cand1, cand2])
+        with mock.patch("webui.app.load_traffic_snapshot", return_value=snap):
+            response = self.client.get("/traffic")
+        
+        self.assertEqual(response.status_code, 200)
+        self.assertIn("Workflow Traffic Control", response.text)
+        self.assertIn("1. Runnable Lanes", response.text)
+        self.assertIn("3. Blocked Items", response.text)
+        self.assertIn("Traffic View Implementation", response.text)
+        self.assertIn("depends on unresolved issue(s) #640", response.text)
+
+    def test_api_traffic_json_route(self):
+        cand = WorkCandidate(
+            kind="issue",
+            number=640,
+            state="open",
+            labels=("status:ready",),
+            title="Traffic View API Test",
+            priority=20,
+        )
+        snap = load_traffic_snapshot(candidates=[cand])
+        with mock.patch("webui.app.load_traffic_snapshot", return_value=snap):
+            response = self.client.get("/api/traffic")
+        
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertEqual(data["project_id"], "gitea-tools")
+        self.assertEqual(len(data["runnable"]), 1)
+        self.assertEqual(data["runnable"][0]["number"], 640)
+
+    def test_render_traffic_fail_closed_page(self):
+        snap = TrafficSnapshot(
+            project_id="gitea-tools",
+            repo_label="Scaled-Tech-Consulting/Gitea-Tools",
+            runnable=(),
+            leased=(),
+            blocked=(),
+            needs_controller=(),
+            terminal_complete=(),
+            next_roles=(),
+            fetch_error="Gitea credentials unavailable for gitea.prgs.cc",
+            inventory_complete=False,
+        )
+        html = render_traffic_page(snap)
+        self.assertIn("Traffic data unavailable", html)
+        self.assertIn("Fail closed", html)
+        self.assertNotIn("1. Runnable Lanes", html)
+
+
+if __name__ == "__main__":
+    unittest.main()

webui/app.py

@@ -42,6 +42,8 @@ from webui.lease_loader import load_lease_snapshot, snapshot_to_dict as lease_sn
 from webui.lease_views import render_leases_page
 from webui.queue_loader import load_queue_snapshot, snapshot_to_dict as queue_snapshot_to_dict
 from webui.queue_views import render_queue_page
+from webui.traffic_loader import load_traffic_snapshot, snapshot_to_dict as traffic_snapshot_to_dict
+from webui.traffic_views import render_traffic_page
 from webui.worktree_scanner import load_hygiene_snapshot, snapshot_to_dict as worktree_snapshot_to_dict
 from webui.worktree_views import render_worktrees_page
 from webui.runtime_health import load_runtime_snapshot, snapshot_to_dict as runtime_snapshot_to_dict
@@ -80,6 +82,7 @@ def _stub_page(title: str, description: str) -> HTMLResponse:
 
 
 _LEGACY_PAGES = (
+    ("/traffic", "Traffic", "workflow traffic-control view (#640)"),
     ("/queue", "Queue", "live PR and issue dashboard (#429)"),
     ("/projects", "Projects", "registry and onboarding (#427)"),
     ("/prompts", "Prompts", "canonical workflow prompt library (#428)"),
@@ -200,6 +203,15 @@ async def api_queue(_request: Request) -> JSONResponse:
     return JSONResponse(queue_snapshot_to_dict(load_queue_snapshot()))
 
 
+async def traffic(_request: Request) -> HTMLResponse:
+    snapshot = load_traffic_snapshot()
+    return HTMLResponse(render_traffic_page(snapshot))
+
+
+async def api_traffic(_request: Request) -> JSONResponse:
+    return JSONResponse(traffic_snapshot_to_dict(load_traffic_snapshot()))
+
+
 def _load_project_registry() -> tuple[ProjectRegistry | None, RegistryError | None]:
     """Load the registry, converting validation failure into a fail-closed pair."""
     try:
@@ -736,6 +748,8 @@ def create_app(*, bind_host: str | None = None) -> Starlette:
             Route("/system-health", system_health, methods=["GET"]),
             Route("/queue", queue, methods=["GET"]),
             Route("/api/queue", api_queue, methods=["GET"]),
+            Route("/traffic", traffic, methods=["GET"]),
+            Route("/api/traffic", api_traffic, methods=["GET"]),
             Route("/projects", projects, methods=["GET"]),
             Route("/projects/{project_id}", project_detail, methods=["GET"]),
             Route("/api/projects", api_projects, methods=["GET"]),

webui/lease_loader.py

@@ -182,10 +182,17 @@ def _extract_reviewer_leases(
             parsed = parse_reviewer_lease_comment(comment.get("body") or "")
             if not parsed:
                 continue
+            subject_pr = parsed.get("pr_number") or pr_number
             leases.append(
                 {
                     **parsed,
-                    "pr_number": parsed.get("pr_number") or pr_number,
+                    "pr_number": subject_pr,
+                    # The lease subject is the PR, never the linked issue: a
+                    # reviewer lease on PR #N must not be attributed to issue #N
+                    # or to the issue that PR closes (#640).
+                    "kind": "pr",
+                    "number": subject_pr,
+                    "role": "reviewer",
                     "comment_id": comment.get("id"),
                     "author": (comment.get("user") or {}).get("login"),
                     "created_at": comment.get("created_at"),

webui/nav.py

@@ -41,6 +41,7 @@ NAV_GROUPS: tuple[NavGroup, ...] = (
         NavItem("/system-health", "System health"),
     )),
     NavGroup("Traffic", (
+        NavItem("/traffic", "Traffic control"),
         NavItem("/queue", "Queue"),
         NavItem("/leases", "Leases"),
         NavItem("/actions", "Actions"),

webui/queue_loader.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 import os
 import re
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from datetime import datetime, timezone
 from typing import Any, Callable
 from urllib.parse import urlparse
@@ -31,10 +31,20 @@ class PaginationMeta:
 
 @dataclass(frozen=True)
 class QueueItem:
+    """One queue row.
+
+    ``extra`` holds *display* strings for the queue page (values are truncated
+    or humanized for rendering). ``signals`` holds the *authoritative* typed
+    values taken straight from the Gitea payload, for consumers that classify
+    or pin state rather than render it (#640). Never derive identity or
+    concurrency decisions from ``extra``.
+    """
+
     number: int
     title: str
     badges: tuple[str, ...]
     extra: dict[str, str]
+    signals: dict[str, Any] = field(default_factory=dict)
 
 
 @dataclass(frozen=True)
@@ -134,21 +144,37 @@ def _format_pr_item(pr: dict, badges: tuple[str, ...]) -> QueueItem:
         "mergeable" if mergeable is True else "conflicted" if mergeable is False else "unknown"
     )
     linked = _extract_linked_issue(pr.get("title"), pr.get("body"))
+    head_sha = str(head.get("sha") or "")
+    labels = tuple(
+        str(lb.get("name") or "") for lb in (pr.get("labels") or []) if lb.get("name")
+    )
     return QueueItem(
         number=int(pr["number"]),
         title=str(pr.get("title") or ""),
         badges=badges,
         extra={
             "branch": f"{head.get('ref', '?')} → {base.get('ref', '?')}",
-            "head_sha": str(head.get("sha") or "")[:12],
+            # Display only — truncated. Pin against signals["head_sha"] instead.
+            "head_sha": head_sha[:12],
             "mergeable": merge_label,
             "linked_issue": str(linked) if linked is not None else "",
         },
+        signals={
+            "head_sha": head_sha,
+            "head_ref": str(head.get("ref") or ""),
+            "base_ref": str(base.get("ref") or ""),
+            "mergeable": mergeable if isinstance(mergeable, bool) else None,
+            "labels": labels,
+            "linked_issue": linked,
+        },
     )
 
 
 def _format_issue_item(issue: dict, badges: tuple[str, ...]) -> QueueItem:
-    labels = ", ".join(lb.get("name", "") for lb in issue.get("labels", []))
+    label_names = tuple(
+        str(lb.get("name") or "") for lb in (issue.get("labels") or []) if lb.get("name")
+    )
+    labels = ", ".join(label_names)
     assignee = (issue.get("assignee") or {}).get("login", "")
     return QueueItem(
         number=int(issue["number"]),
@@ -159,6 +185,11 @@ def _format_issue_item(issue: dict, badges: tuple[str, ...]) -> QueueItem:
             "assignee": assignee or "unassigned",
             "state": str(issue.get("state") or ""),
         },
+        signals={
+            "labels": label_names,
+            "assignee": assignee,
+            "state": str(issue.get("state") or ""),
+        },
     )
 
 

webui/sanctioned_restart.py

@@ -38,6 +38,7 @@ from dataclasses import asdict, dataclass
 from typing import Any
 
 import mcp_namespace_health
+import restart_coordinator
 import runtime_recovery_guard
 from webui import console_audit, console_authz
 
@@ -99,6 +100,14 @@ def _clean(value: Any) -> str:
     return str(value or "").strip()
 
 
+def restart_class_for_mode(mode: str) -> str:
+    """Map the existing namespace controls onto the #663 class taxonomy."""
+
+    if _clean(mode) == MODE_RELOAD:
+        return restart_coordinator.RestartClass.CONFIGURATION_RELOAD.value
+    return restart_coordinator.RestartClass.ROLE_RUNTIME_RESTART.value
+
+
 # --- Mutation ledger --------------------------------------------------------
 
 
@@ -256,6 +265,7 @@ def build_restart_preview(
 
     return {
         "action_id": action_id,
+        "restart_class": restart_class_for_mode(md),
         "namespace": ns,
         "mode": md,
         "scope_valid": scope_error is None,
@@ -309,6 +319,7 @@ def assess_restart_request(
             "reason_code": reason_code,
             "detail": detail,
             "action_id": action_id,
+            "restart_class": restart_class_for_mode(md),
             "namespace": ns,
             "mode": md,
             "preview": preview,
@@ -393,6 +404,7 @@ def assess_restart_request(
             "process."
         ),
         "action_id": action_id,
+        "restart_class": restart_class_for_mode(md),
         "namespace": ns,
         "mode": md,
         "preview": preview,
@@ -441,7 +453,11 @@ def execute_restart(
             else console_audit.RESULT_DENIED
         ),
         principal=principal,
-        target={"namespace": assessment["namespace"], "mode": assessment["mode"]},
+        target={
+            "namespace": assessment["namespace"],
+            "mode": assessment["mode"],
+            "restart_class": assessment["restart_class"],
+        },
         reason_code=assessment["reason_code"],
         detail=assessment["detail"],
         request_id=request_id,
@@ -450,6 +466,7 @@ def execute_restart(
             "gates_passed": assessment["gates_passed"],
             "process_kill_executed": False,
             "post_restart_verification_required": True,
+            "restart_class": assessment["restart_class"],
         },
     )
 
@@ -463,6 +480,7 @@ def execute_restart(
         "namespace": assessment["namespace"],
         "mode": assessment["mode"],
         "action_id": action_id,
+        "restart_class": assessment["restart_class"],
         "process_kill_executed": False,
         "host_hook": assessment["preview"]["restart_hook"],
         "next_action": (

webui/traffic_loader.py

@@ -0,0 +1,449 @@
+"""Traffic-control view loader for Phase 1 operator web console (#640).
+
+Combines queue snapshots, inventory leases, dependency graph classifications,
+and workflow dashboard rules to deliver full traffic-control visibility:
+runnable, leased (in-progress), blocked (dependency/lock), needs-controller,
+and terminal-complete candidates.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any, Callable, Sequence
+
+from webui.project_registry import find_project, load_registry
+from webui.queue_loader import load_queue_snapshot, QueueSnapshot
+from webui.lease_loader import load_lease_snapshot, LeaseSnapshot
+from workflow_dashboard import (
+    DashboardSnapshot,
+    QueueEntry,
+    RoleNextAction,
+    build_workflow_dashboard,
+    DASHBOARD_ROLES,
+)
+from allocator_service import WorkCandidate
+
+
+@dataclass(frozen=True)
+class TrafficItem:
+    kind: str  # "issue" or "pr"
+    number: int
+    title: str
+    traffic_state: str  # "runnable", "leased", "blocked", "needs_controller", "terminal_complete"
+    expected_role: str
+    safe_for_roles: tuple[str, ...]
+    badges: tuple[str, ...]
+    block_reason: str | None = None
+    lease_info: dict[str, Any] | None = None
+    head_sha: str | None = None
+
+    @property
+    def is_safe(self) -> bool:
+        return self.block_reason is None and bool(self.safe_for_roles)
+
+    def as_dict(self) -> dict[str, Any]:
+        return {
+            "kind": self.kind,
+            "number": self.number,
+            "title": self.title,
+            "traffic_state": self.traffic_state,
+            "expected_role": self.expected_role,
+            "safe_for_roles": list(self.safe_for_roles),
+            "badges": list(self.badges),
+            "block_reason": self.block_reason,
+            "lease_info": self.lease_info,
+            "head_sha": self.head_sha,
+            "is_safe": self.is_safe,
+        }
+
+
+@dataclass(frozen=True)
+class TrafficSnapshot:
+    project_id: str
+    repo_label: str
+    runnable: tuple[TrafficItem, ...]
+    leased: tuple[TrafficItem, ...]
+    blocked: tuple[TrafficItem, ...]
+    needs_controller: tuple[TrafficItem, ...]
+    terminal_complete: tuple[TrafficItem, ...]
+    next_roles: tuple[dict[str, Any], ...]
+    fetch_error: str | None = None
+    inventory_complete: bool = True
+
+    def as_dict(self) -> dict[str, Any]:
+        return {
+            "project_id": self.project_id,
+            "repo_label": self.repo_label,
+            "runnable": [i.as_dict() for i in self.runnable],
+            "leased": [i.as_dict() for i in self.leased],
+            "blocked": [i.as_dict() for i in self.blocked],
+            "needs_controller": [i.as_dict() for i in self.needs_controller],
+            "terminal_complete": [i.as_dict() for i in self.terminal_complete],
+            "next_roles": list(self.next_roles),
+            "fetch_error": self.fetch_error,
+            "inventory_complete": self.inventory_complete,
+        }
+
+
+def _classify_traffic_item(
+    entry: QueueEntry,
+    *,
+    lease_info: dict[str, Any] | None = None,
+) -> TrafficItem:
+    """Classify a QueueEntry into a TrafficItem with explicit traffic state."""
+    badges = list(entry.badges)
+    block_reason = entry.block_reason
+    expected_role = entry.expected_role
+
+    entry_is_safe = entry.block_reason is None and bool(entry.safe_for_roles)
+    # Lease state is checked first: an item that is both leased and blocked is
+    # reported as leased. That is safe by construction — a leased item is never
+    # placed in the runnable lane — and it keeps the operator's attention on the
+    # session that currently owns the work. The blocker text still renders.
+    if lease_info is not None or "in-progress" in badges or "claimed" in badges:
+        state = "leased"
+    elif expected_role == "reconciler" or "terminal-lock" in badges:
+        state = "terminal_complete"
+    elif expected_role == "controller" or "contaminated" in badges or "needs-controller" in badges:
+        state = "needs_controller"
+    elif (
+        block_reason is not None
+        or "blocked" in badges
+        or "dependency-unmet" in badges
+        or "blocked-by-terminal" in badges
+        or "status:blocked" in badges
+    ):
+        state = "blocked"
+    elif entry_is_safe:
+        state = "runnable"
+    else:
+        state = "needs_controller"
+
+    return TrafficItem(
+        kind=entry.kind,
+        number=entry.number,
+        title=entry.title,
+        traffic_state=state,
+        expected_role=expected_role,
+        safe_for_roles=entry.safe_for_roles,
+        badges=tuple(badges),
+        block_reason=block_reason,
+        lease_info=lease_info,
+        head_sha=entry.head_sha,
+    )
+
+
+# Claim statuses from ``issue_claim_heartbeat.build_claim_inventory`` that mean
+# a live worker currently holds the issue. Everything else (``stale``,
+# ``phantom``, ``reclaimable``, ``not_claimed``) is reported through the
+# dashboard's stale-lease channel and is never rendered as an active lease.
+_ACTIVE_CLAIM_STATUSES = frozenset({"active", "awaiting_review"})
+
+# Statuses that positively mean "not an active lease" for any lease record.
+_INACTIVE_LEASE_STATUSES = frozenset(
+    {"expired", "stale", "released", "moot", "reclaimable", "phantom", "not_claimed"}
+)
+
+
+def _candidates_from_queue_snapshot(q_snap: QueueSnapshot) -> list[WorkCandidate]:
+    """Build allocator candidates from the queue loader's authoritative signals.
+
+    Display badges (``blocked``/``claimed``/``duplicate``/``stale``/
+    ``in-review``/``open``) are rendering hints, not routing state, so nothing
+    here branches on them. Every routing field comes from
+    ``QueueItem.signals`` — the raw Gitea payload values.
+
+    The queue loader reads ``/pulls`` and ``/issues`` only; it never fetches
+    review verdicts. ``request_changes_current_head`` / ``approval_on_current_head``
+    are therefore left at their fail-safe ``False`` rather than being guessed
+    from badges: an unproven approval must never route a PR to the merger.
+    """
+    candidates: list[WorkCandidate] = []
+
+    for pr in q_snap.prs:
+        signals = pr.signals or {}
+        head_sha = str(signals.get("head_sha") or "").strip()
+        mergeable = signals.get("mergeable")
+        labels = tuple(str(x) for x in (signals.get("labels") or ()))
+        candidates.append(
+            WorkCandidate(
+                kind="pr",
+                number=pr.number,
+                state="open",
+                labels=labels,
+                title=pr.title,
+                # Full 40-char SHA from head.sha — never the 12-char display value.
+                head_sha=head_sha or None,
+                priority=5,
+                mergeable=mergeable is True,
+                blocked=mergeable is False or "status:blocked" in labels,
+            )
+        )
+
+    for issue in q_snap.issues:
+        signals = issue.signals or {}
+        labels = tuple(str(x) for x in (signals.get("labels") or ()))
+        lowered = {label.lower() for label in labels}
+        candidates.append(
+            WorkCandidate(
+                kind="issue",
+                number=issue.number,
+                state="open",
+                labels=labels,
+                title=issue.title,
+                priority=20 if "status:ready" in lowered else 10,
+                blocked="status:blocked" in lowered,
+                # A live claim by another session is not this session's work.
+                already_claimed_elsewhere="status:in-progress" in lowered,
+            )
+        )
+
+    return candidates
+
+
+def _claim_lease_records(inventory: dict[str, Any] | None) -> list[dict[str, Any]]:
+    """Normalize ``build_claim_inventory`` entries into lease records.
+
+    The inventory contract is ``{"entries", "counts", "heartbeat_lease_minutes",
+    "reclaim_after_minutes", "in_progress_total"}``. Each entry is keyed by
+    ``issue_number``; the subject kind is therefore always ``issue``.
+    """
+    entries = (inventory or {}).get("entries") or ()
+    records: list[dict[str, Any]] = []
+    for entry in entries:
+        if not isinstance(entry, dict):
+            continue
+        number = entry.get("issue_number")
+        if number is None:
+            continue
+        try:
+            number_int = int(number)
+        except (TypeError, ValueError):
+            continue
+        heartbeat = entry.get("latest_heartbeat") or {}
+        record = dict(entry)
+        record.update(
+            {
+                "kind": "issue",
+                "number": number_int,
+                "role": "author",
+                "lease_source": "issue-claim-heartbeat",
+            }
+        )
+        if isinstance(heartbeat, dict):
+            if heartbeat.get("session_id") and not record.get("session_id"):
+                record["session_id"] = heartbeat.get("session_id")
+            if heartbeat.get("author") and not record.get("author"):
+                record["author"] = heartbeat.get("author")
+        records.append(record)
+    return records
+
+
+def _lease_subject(lease: dict[str, Any]) -> tuple[str, int] | None:
+    """Return the ``(kind, number)`` a lease record actually covers.
+
+    Fails closed: a record that does not identify exactly one subject is
+    dropped rather than attributed to a guessed work item (#640 — never invent
+    a lease, and never attach a PR lease to a same-numbered issue).
+    """
+    kind = str(lease.get("kind") or lease.get("work_kind") or "").strip().lower()
+    pr_number = lease.get("pr_number")
+    issue_number = lease.get("issue_number")
+
+    if kind not in ("pr", "issue"):
+        if pr_number is not None and issue_number is None:
+            kind = "pr"
+        elif issue_number is not None and pr_number is None:
+            kind = "issue"
+        else:
+            return None
+
+    number = lease.get("number")
+    if number is None:
+        number = lease.get("work_number")
+    if number is None:
+        number = pr_number if kind == "pr" else issue_number
+    if number is None:
+        return None
+    try:
+        return kind, int(number)
+    except (TypeError, ValueError):
+        return None
+
+
+def _is_active_lease(lease: dict[str, Any]) -> bool:
+    """True when the record proves a worker currently holds the item."""
+    if lease.get("stale") or lease.get("expired"):
+        return False
+    status = str(lease.get("status") or lease.get("lease_status") or "").strip().lower()
+    if status in _INACTIVE_LEASE_STATUSES:
+        return False
+    if lease.get("lease_source") == "issue-claim-heartbeat":
+        return status in _ACTIVE_CLAIM_STATUSES
+    return True
+
+
+def load_traffic_snapshot(
+    *,
+    candidates: Sequence[WorkCandidate] | None = None,
+    leases: Sequence[dict[str, Any]] | None = None,
+    terminal_pr: int | None = None,
+    fetch_queue_snapshot: Callable[[], QueueSnapshot] | None = None,
+    fetch_lease_snapshot: Callable[[], LeaseSnapshot] | None = None,
+    project_id: str = "gitea-tools",
+) -> TrafficSnapshot:
+    """Load and compute the traffic-control snapshot."""
+    try:
+        reg = load_registry()
+        proj = find_project(reg, project_id)
+        repo_label = proj.remote_repo if proj else "Scaled-Tech-Consulting/Gitea-Tools"
+    except Exception:
+        repo_label = "Scaled-Tech-Consulting/Gitea-Tools"
+
+    # Injected candidates path (pure unit testing)
+    if candidates is not None:
+        dashboard = build_workflow_dashboard(
+            candidates=candidates,
+            leases=leases,
+            terminal_pr=terminal_pr,
+            inventory_complete=True,
+        )
+        return _build_traffic_snapshot_from_dashboard(
+            project_id=project_id,
+            repo_label=repo_label,
+            dashboard=dashboard,
+            leases=leases or (),
+        )
+
+    # Live snapshot loading
+    q_loader = fetch_queue_snapshot or load_queue_snapshot
+    l_loader = fetch_lease_snapshot or load_lease_snapshot
+
+    try:
+        q_snap = q_loader()
+        l_snap = l_loader()
+    except Exception as exc:  # noqa: BLE001
+        return TrafficSnapshot(
+            project_id=project_id,
+            repo_label=repo_label,
+            runnable=(),
+            leased=(),
+            blocked=(),
+            needs_controller=(),
+            terminal_complete=(),
+            next_roles=(),
+            fetch_error=f"Failed to load traffic state: {exc}",
+            inventory_complete=False,
+        )
+
+    if q_snap.fetch_error or l_snap.fetch_error:
+        err = q_snap.fetch_error or l_snap.fetch_error
+        return TrafficSnapshot(
+            project_id=project_id,
+            repo_label=repo_label,
+            runnable=(),
+            leased=(),
+            blocked=(),
+            needs_controller=(),
+            terminal_complete=(),
+            next_roles=(),
+            fetch_error=err,
+            inventory_complete=False,
+        )
+
+    candidate_list = _candidates_from_queue_snapshot(q_snap)
+
+    raw_leases: list[dict[str, Any]] = _claim_lease_records(l_snap.claim_inventory)
+    for r_lease in l_snap.reviewer_leases or ():
+        if not isinstance(r_lease, dict):
+            continue
+        # Always pin reviewer leases to the PR subject, even if a linked
+        # issue_number is present on the marker (#640 B2).
+        normalized = dict(r_lease)
+        subject = normalized.get("pr_number") or normalized.get("number")
+        if subject is None:
+            continue
+        try:
+            pr_num = int(subject)
+        except (TypeError, ValueError):
+            continue
+        normalized["kind"] = "pr"
+        normalized["number"] = pr_num
+        normalized["pr_number"] = pr_num
+        normalized.setdefault("role", "reviewer")
+        raw_leases.append(normalized)
+
+    dashboard = build_workflow_dashboard(
+        candidates=candidate_list,
+        leases=raw_leases,
+        inventory_complete=q_snap.pr_pagination.inventory_complete if q_snap.pr_pagination else True,
+    )
+
+    return _build_traffic_snapshot_from_dashboard(
+        project_id=project_id,
+        repo_label=repo_label,
+        dashboard=dashboard,
+        leases=raw_leases,
+    )
+
+
+def _build_traffic_snapshot_from_dashboard(
+    *,
+    project_id: str,
+    repo_label: str,
+    dashboard: DashboardSnapshot,
+    leases: Sequence[dict[str, Any]],
+) -> TrafficSnapshot:
+    """Classify dashboard entries into the 5 traffic state buckets."""
+    all_entries = dashboard.open_prs + dashboard.open_issues
+
+    # Map each active lease onto the exact work item it covers. Records whose
+    # subject cannot be determined, and claims that are stale/phantom/
+    # reclaimable, are deliberately dropped instead of guessed.
+    lease_map: dict[tuple[str, int], dict[str, Any]] = {}
+    for lease in leases:
+        if not isinstance(lease, dict) or not _is_active_lease(lease):
+            continue
+        subject = _lease_subject(lease)
+        if subject is not None:
+            lease_map[subject] = lease
+
+    runnable: list[TrafficItem] = []
+    leased: list[TrafficItem] = []
+    blocked: list[TrafficItem] = []
+    needs_controller: list[TrafficItem] = []
+    terminal_complete: list[TrafficItem] = []
+
+    for entry in all_entries:
+        l_info = lease_map.get((entry.kind, entry.number))
+        item = _classify_traffic_item(entry, lease_info=l_info)
+
+        if item.traffic_state == "leased":
+            leased.append(item)
+        elif item.traffic_state == "terminal_complete":
+            terminal_complete.append(item)
+        elif item.traffic_state == "blocked":
+            blocked.append(item)
+        elif item.traffic_state == "needs_controller":
+            needs_controller.append(item)
+        else:
+            runnable.append(item)
+
+    next_roles = [dashboard.next_safe_by_role[r].as_dict() for r in DASHBOARD_ROLES if r in dashboard.next_safe_by_role]
+
+    return TrafficSnapshot(
+        project_id=project_id,
+        repo_label=repo_label,
+        runnable=tuple(runnable),
+        leased=tuple(leased),
+        blocked=tuple(blocked),
+        needs_controller=tuple(needs_controller),
+        terminal_complete=tuple(terminal_complete),
+        next_roles=tuple(next_roles),
+        fetch_error=None,
+        inventory_complete=dashboard.inventory_complete,
+    )
+
+
+def snapshot_to_dict(snapshot: TrafficSnapshot) -> dict[str, Any]:
+    return snapshot.as_dict()

webui/traffic_views.py

@@ -0,0 +1,170 @@
+"""HTML rendering for Phase 1 Traffic-Control View (#640)."""
+
+from __future__ import annotations
+
+from html import escape
+from typing import Sequence
+
+from webui.layout import render_page
+from webui.traffic_loader import TrafficItem, TrafficSnapshot
+
+
+def _render_badges(badges: Sequence[str]) -> str:
+    if not badges:
+        return ""
+    out = []
+    for b in badges:
+        cls = "badge"
+        b_lower = b.lower()
+        if "blocked" in b_lower or "unmet" in b_lower:
+            cls += " badge-blocked"
+        elif "claimed" in b_lower or "in-progress" in b_lower or "leased" in b_lower:
+            cls += " badge-claimed"
+        elif "review" in b_lower or "ready" in b_lower:
+            cls += " badge-in-review"
+        elif "duplicate" in b_lower:
+            cls += " badge-duplicate"
+        elif "stale" in b_lower:
+            cls += " badge-stale"
+        out.append(f'<span class="{cls}">{escape(b)}</span>')
+    return f'<div class="badges">{"".join(out)}</div>'
+
+
+def _render_traffic_item_row(item: TrafficItem) -> str:
+    kind_label = escape(item.kind.upper())
+    num_str = f"#{item.number}"
+    title_str = escape(item.title)
+    role_str = escape(item.expected_role)
+    badges_html = _render_badges(item.badges)
+
+    reason_html = ""
+    if item.block_reason:
+        reason_html = f'<div class="muted" style="font-size:0.82rem; margin-top:0.2rem;"><strong>Blocker:</strong> {escape(item.block_reason)}</div>'
+
+    lease_html = ""
+    if item.lease_info:
+        owner = escape(str(item.lease_info.get("session_id") or item.lease_info.get("reviewer_identity") or "active worker"))
+        lease_html = f'<div class="muted" style="font-size:0.82rem; margin-top:0.2rem;"><strong>Lease:</strong> {owner}</div>'
+
+    return f"""<tr>
+  <td><code>{kind_label} {num_str}</code></td>
+  <td>
+    <div><strong>{title_str}</strong> {badges_html}</div>
+    {reason_html}
+    {lease_html}
+  </td>
+  <td><code>{role_str}</code></td>
+</tr>"""
+
+
+def _render_traffic_table(items: Sequence[TrafficItem], empty_message: str) -> str:
+    if not items:
+        return f'<p class="muted">{escape(empty_message)}</p>'
+
+    rows = "".join(_render_traffic_item_row(item) for item in items)
+    return f"""<table class="registry">
+  <thead>
+    <tr>
+      <th style="width: 15%;">Item</th>
+      <th style="width: 65%;">Title & Details</th>
+      <th style="width: 20%;">Next Role</th>
+    </tr>
+  </thead>
+  <tbody>
+    {rows}
+  </tbody>
+</table>"""
+
+
+def _render_next_roles(next_roles: Sequence[dict]) -> str:
+    if not next_roles:
+        return ""
+
+    cards = []
+    for r in next_roles:
+        role = escape(r.get("role", "unknown"))
+        status = r.get("status", "idle")
+        prompt = escape(r.get("prompt", ""))
+
+        status_cls = "badge-health-ok" if status == "safe" else ("badge-blocked" if "blocked" in status else "badge-health-skipped")
+        cards.append(f"""<div class="health-card" style="margin-bottom:0.75rem;">
+  <div style="display:flex; justify-content:space-between; align-items:center;">
+    <h3>Role: <code>{role}</code></h3>
+    <span class="badge {status_cls}">status: {escape(status)}</span>
+  </div>
+  <p class="meta" style="margin:0.35rem 0 0;">{prompt}</p>
+</div>""")
+
+    return f"""<div style="margin: 1.5rem 0;">
+  <h3>Next Safe Role Actions</h3>
+  {"".join(cards)}
+</div>"""
+
+
+def render_traffic_page(snapshot: TrafficSnapshot) -> str:
+    """Render the full HTML view for workflow traffic control."""
+    if snapshot.fetch_error:
+        body = f"""<h2>Workflow Traffic Control</h2>
+<p class="meta">Repository: <code>{escape(snapshot.repo_label)}</code></p>
+<div class="health-card health-stale">
+  <h3>Traffic data unavailable</h3>
+  <p class="health-headline">{escape(snapshot.fetch_error)}</p>
+  <p class="muted">Fail closed: traffic state cannot be established cleanly. Check credentials or remote connectivity.</p>
+</div>"""
+        return render_page(title="Traffic Control", body_html=body)
+
+    runnable_count = len(snapshot.runnable)
+    leased_count = len(snapshot.leased)
+    blocked_count = len(snapshot.blocked)
+    controller_count = len(snapshot.needs_controller)
+    terminal_count = len(snapshot.terminal_complete)
+
+    summary_bar = f"""<div class="health-card" style="display:flex; flex-wrap:wrap; gap:1rem; align-items:center;">
+  <div><strong>Runnable:</strong> <span class="badge badge-health-ok">{runnable_count}</span></div>
+  <div><strong>Leased:</strong> <span class="badge badge-claimed">{leased_count}</span></div>
+  <div><strong>Blocked:</strong> <span class="badge badge-blocked">{blocked_count}</span></div>
+  <div><strong>Needs Controller:</strong> <span class="badge badge-duplicate">{controller_count}</span></div>
+  <div><strong>Terminal Complete:</strong> <span class="badge badge-stale">{terminal_count}</span></div>
+</div>"""
+
+    next_roles_html = _render_next_roles(snapshot.next_roles)
+
+    sections_html = f"""
+<div class="prompt-card">
+  <h3>1. Runnable Lanes (Ready for Allocation)</h3>
+  <p class="muted">Safe work items with no unmet dependencies or active leases. Safe for allocation.</p>
+  {_render_traffic_table(snapshot.runnable, "No runnable items ready for allocation.")}
+</div>
+
+<div class="prompt-card">
+  <h3>2. In-Progress Work (Active Leases)</h3>
+  <p class="muted">Work items currently leased and actively being worked by an assigned role session.</p>
+  {_render_traffic_table(snapshot.leased, "No active leases in flight.")}
+</div>
+
+<div class="prompt-card">
+  <h3>3. Blocked Items (Dependencies / Locks)</h3>
+  <p class="muted">Items blocked by unmet dependency issues, a missing head pin, a merge conflict, or an active terminal review lock. Items labelled status:blocked route to section 4. Never presented as safe.</p>
+  {_render_traffic_table(snapshot.blocked, "No blocked items.")}
+</div>
+
+<div class="prompt-card">
+  <h3>4. Needs Controller Intervention</h3>
+  <p class="muted">Items requiring controller routing, diagnosis, or cross-role assignment.</p>
+  {_render_traffic_table(snapshot.needs_controller, "No items requiring controller intervention.")}
+</div>
+
+<div class="prompt-card">
+  <h3>5. Terminal / Complete Candidates</h3>
+  <p class="muted">Items ready for terminal reconciliation or post-merge worktree cleanup.</p>
+  {_render_traffic_table(snapshot.terminal_complete, "No terminal complete candidates.")}
+</div>
+"""
+
+    body = f"""<h2>Workflow Traffic Control</h2>
+<p class="meta">Repository: <code>{escape(snapshot.repo_label)}</code></p>
+{summary_bar}
+{next_roles_html}
+{sections_html}"""
+
+    return render_page(title="Traffic Control", body_html=body)