Merge remote-tracking branch 'prgs/master' into feat/issue-514-branch-delete-guard

# Conflicts:
#	gitea_mcp_server.py

gitea_mcp_server.py

@@ -829,6 +829,13 @@ import review_merge_state_machine  # noqa: E402
 import pr_work_lease  # noqa: E402
 import native_mcp_preference  # noqa: E402
 import branch_cleanup_guard  # noqa: E402
+import master_parity_gate  # noqa: E402
+
+# Master-parity baseline (#420): the commit this server process started at.
+# Captured once so that, at mutation time, we can detect when the on-disk
+# master has advanced past the running code and fail closed until restart.
+# Read-only operations are never blocked by staleness.
+_STARTUP_PARITY = master_parity_gate.capture_startup_parity(PROJECT_ROOT)
 import worktree_cleanup_audit  # noqa: E402
 
 
@@ -5729,15 +5736,41 @@ def _try_auto_switch_for_operation(op: str, host: str | None = None) -> bool:
     return False
 
 
+def _current_master_parity() -> dict:
+    """Assess this process's code against the on-disk master HEAD (#420)."""
+    current_head = master_parity_gate.read_git_head(PROJECT_ROOT)
+    return master_parity_gate.assess_master_parity(_STARTUP_PARITY, current_head)
+
+
+def _master_parity_block(op: str) -> list[str]:
+    """Fail-closed staleness reasons for a mutation *op* (#420).
+
+    Read-only operations (``gitea.read``) are never blocked: a stale server can
+    still be inspected. Any other (mutating) operation is refused when the
+    on-disk master has definitively advanced past the running code, since newly
+    merged capability gates would not yet be loaded in memory.
+    """
+    if op == "gitea.read":
+        return []
+    return master_parity_gate.parity_block_reasons(_current_master_parity())
+
+
 def _profile_operation_gate(op: str) -> list[str]:
-    """Profile permission check for a single gated operation (#126, #216).
+    """Profile permission check for a single gated operation (#126, #216, #420).
 
     Issue discussion comments are gated separately from the gitea.pr.*
     review/merge family: listing requires ``gitea.read``, creating requires
     ``gitea.issue.comment``. Closing a PR requires the distinct
     ``gitea.pr.close`` (#216). Returns a list of block reasons (empty =
     allowed); an unreadable profile fails closed.
+
+    A mutating operation is additionally refused when the server code is stale
+    relative to master (#420), so a long-running process cannot bypass a
+    capability gate that has since been merged.
     """
+    stale_reasons = _master_parity_block(op)
+    if stale_reasons:
+        return stale_reasons
     try:
         profile = get_profile()
     except Exception as exc:
@@ -7841,6 +7874,24 @@ def gitea_get_runtime_context(
             PROJECT_ROOT),
     }
 
+    parity = _current_master_parity()
+    result["master_parity"] = {
+        "in_parity": parity["in_parity"],
+        "stale": parity["stale"],
+        "restart_required": parity["restart_required"],
+        "startup_head": parity["startup_head"],
+        "current_head": parity["current_head"],
+        "summary": master_parity_gate.format_parity(parity),
+        "mutation_gate_enforced": not master_parity_gate.gate_disabled(),
+    }
+    if parity["stale"] and not master_parity_gate.gate_disabled():
+        safe_next_action = (
+            "Server code is stale relative to master; restart the Gitea MCP "
+            "server to load current capability gates before mutating. "
+            f"({master_parity_gate.format_parity(parity)})"
+        )
+        result["safe_next_action"] = safe_next_action
+
     if reveal and h:
         result["server"] = gitea_url(h, "").rstrip("/")
 
@@ -7848,6 +7899,43 @@ def gitea_get_runtime_context(
 
 
 @mcp.tool()
+def gitea_assess_master_parity(
+    remote: str = "dadeschools",
+    host: str | None = None,
+) -> dict:
+    """Read-only: is the running server code in parity with the on-disk master?
+
+    The MCP server loads its capability-gate code into memory at startup;
+    ``master`` advancing (e.g. a newly merged security gate) does not take
+    effect until the process restarts. This tool compares the commit the
+    process started at against the current workspace ``HEAD`` and reports
+    whether a restart is required before mutations are safe again (#420).
+
+    Never mutates and makes no network calls. Read-only operations are never
+    blocked by staleness; only mutating operations fail closed while stale.
+
+    Returns:
+        dict with 'in_parity', 'stale', 'restart_required', 'startup_head',
+        'current_head', 'mutation_gate_enforced', 'summary', 'reasons', and a
+        'report' recovery payload when stale.
+    """
+    parity = _current_master_parity()
+    enforced = not master_parity_gate.gate_disabled()
+    out = {
+        "in_parity": parity["in_parity"],
+        "stale": parity["stale"],
+        "restart_required": parity["restart_required"],
+        "determinable": parity["determinable"],
+        "startup_head": parity["startup_head"],
+        "current_head": parity["current_head"],
+        "mutation_gate_enforced": enforced,
+        "summary": master_parity_gate.format_parity(parity),
+        "reasons": parity["reasons"],
+        "process_root": PROJECT_ROOT,
+    }
+    if parity["stale"] and enforced:
+        out["report"] = master_parity_gate.parity_report(parity)
+    return out
 def gitea_record_pre_review_command(
     command: str,
     cwd: str | None = None,