feat(reviewer): add queue-target lock before PR inventory trust gate (#200)

Operators can supply an active PR backlog for one repo while agents
inventory another and falsely report trusted_empty. reconcile_queue_target
locks the target repo from operator context/backlog before list_prs runs;
pr_inventory_trust_gate blocks target_repo_mismatch and unresolved locks.
assess_reviewer_queue_inventory wires the lock into the canonical path.

Tests cover Gitea-Tools backlog vs mcp-control-plane inventory mismatch,
ambiguous dual-repo context, conflicting directive vs backlog, and final-
report field requirements.

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

skills/llm-project-workflow/SKILL.md

@@ -225,7 +225,10 @@ Worktree folder = branch with `/` replaced by `-`
    the other.
    Both configured repos must be reported with state filter, pagination proof,
    and open-PR count (`review_proofs.assess_inventory_completeness` and
-   `resolve_repos_from_user_reference`).
+   `resolve_repos_from_user_reference`). Before inventory, reconcile the
+   operator-supplied PR backlog against the target repo
+   (`review_proofs.reconcile_queue_target`); never report `trusted_empty`
+   for one repo while ignoring contradictory supplied PR numbers in another.
 7. **Role-boundary proof (#175):** a reviewer queue task must not silently
    become author implementation. If no eligible PR exists, stop with the
    queue report. Do not claim issues, create branches, commit, push, or open