feat: add reconciliation workflow MCP tools for already-landed PRs (Closes #301)

Expose read-only assess/scan tools and capability planning so already-landed
open PRs can be reconciled without review or merge. Register the
gitea-reconcile-landed-pr skill and workflow-source verification.

review_proofs.py

@@ -17,6 +17,11 @@ here weakens or replaces them.
 import re
 
 import issue_duplicate_gate
+from reconciliation_workflow import (
+    RECONCILE_TASK_MARKERS,
+    RECONCILE_WORKFLOW_MARKERS,
+    assess_reconcile_workflow_source,
+)
 from reviewer_worktree import assess_reviewer_worktree_proof
 
 _FULL_SHA = re.compile(r"^[0-9a-f]{40}$")