feat: add reviewer final-report schema MCP validator (Closes #391)

Expose gitea_validate_review_final_report composing the composable
final-report validator with review-specific schema gates for legacy
fields, merge/issue claims, blocked handoff replay, and narrative drift.

gitea_mcp_server.py

@@ -4859,6 +4859,35 @@ def gitea_get_shell_health() -> dict:
     return native_mcp_preference.shell_health_status()
 
 
+@mcp.tool()
+def gitea_validate_review_final_report(
+    report_text: str,
+    review_decision_lock: dict | None = None,
+    linked_issue_lock: dict | None = None,
+    validation_report: dict | None = None,
+    action_log: list[dict] | None = None,
+    mutations_observed: bool = False,
+    local_edits: bool = False,
+) -> dict:
+    """Read-only: machine-validate reviewer final report schema before output (#391).
+
+    Composes the composable final-report validator with review-specific schema
+    gates (legacy fields, mutation categories, merge/issue claims, blocked
+    handoff replay, and narrative/handoff consistency).
+    """
+    from review_final_report_schema import assess_review_final_report_schema
+
+    return assess_review_final_report_schema(
+        report_text,
+        review_decision_lock=review_decision_lock,
+        linked_issue_lock=linked_issue_lock,
+        validation_report=validation_report,
+        action_log=action_log,
+        mutations_observed=mutations_observed,
+        local_edits=local_edits,
+    )
+
+
 @mcp.tool()
 def gitea_get_runtime_context(
     remote: str = "dadeschools",