Merge pull request 'feat: enforce reconciler PR-close proof fields in final reports (Closes #306)' (#423) from feat/issue-306-reconciler-close-proof into master

skills/llm-project-workflow/workflows/reconcile-landed-pr.md

@@ -375,6 +375,24 @@ Include:
 * confirmation that no normal review, approval, request-changes, or merge was
   performed
 
+## 18A. Reconciler close proof is enforced (#306)
+
+When a reconciler run closes a PR, the final-report validator
+(`final_report_validator` rule `reconcile.close_proof_fields`) **blocks** the
+handoff unless it carries all four close proofs. The prompt is guidance; the
+MCP validator is the authority.
+
+A close is detected from `PRs closed: #<n>` (or a session close lock). Once a
+close is reported, the handoff must include:
+
+* `Capabilities proven:` naming `gitea.pr.close` — the exact close capability
+* `Ancestor proof:` — the landed/ancestor proof for the closed PR
+* `PRs closed:` — the PR close result (the closed PR number)
+* `Linked issue live status:` (or `Issues closed:`) — the linked-issue result
+
+Comment-only and blocked reconciliations (no PR close) are unaffected: the rule
+returns no finding when nothing was closed.
+
 ## 19. Local artifact and report consistency rule
 
 Do not create local walkthrough, notes, markdown, JSON, or report artifacts