feat(reviewer): fail closed on dirty worktrees and forbidden git cleanup (#233)

Add reviewer_worktree proofs that block stash/reset/checkout -- cleanup of
unrelated local files, require scratch worktree reporting when the main tree
is dirty outside PR scope, and integrate the gate into final report grading
and Controller Handoff review fields.

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

tests/test_review_proofs.py

@@ -183,6 +183,24 @@ def _good_review_mutation():
     return assess_review_mutation_final_report(report, lock)
 
 
+def _good_worktree(**overrides):
+    proof = {
+        "worktree_path": "/repo/branches/review-feat-issue-224",
+        "porcelain_status": "",
+        "pr_scope_files": ["docs/wiki/Repositories.md"],
+        "scratch_used": True,
+        "scratch_path": "/repo/branches/review-feat-issue-224",
+        "git_commands": [
+            "git fetch prgs master feat/issue-224-wiki-proof-refresh",
+            "git diff prgs/master...prgs/feat/issue-224-wiki-proof-refresh",
+        ],
+    }
+    proof.update(overrides)
+    from reviewer_worktree import assess_reviewer_worktree_proof  # noqa: E402
+
+    return assess_reviewer_worktree_proof(proof)
+
+
 def _good_role_boundary_179(**overrides):
     kwargs = {
         "task_role": "reviewer",
@@ -595,6 +613,13 @@ class TestFinalReport(unittest.TestCase):
             "controller_handoff": _good_handoff(),
             "capability_proof": _good_capability_proof(),
             "sweep_proof": _good_secret_sweep(),
+            "worktree_proof": {
+                "worktree_path": "/repo/branches/review-feat-issue-224",
+                "porcelain_status": "",
+                "pr_scope_files": ["docs/wiki/Repositories.md"],
+                "scratch_used": True,
+                "scratch_path": "/repo/branches/review-feat-issue-224",
+            },
         }
         kwargs.update(overrides)
         return build_final_report(**kwargs)
@@ -899,12 +924,17 @@ class TestControllerHandoff(unittest.TestCase):
         result = assess_controller_handoff(self.BASE_HANDOFF, role="review")
         self.assertEqual(result["verdict"], "incomplete")
         self.assertIn("Pinned reviewed head", result["missing_fields"])
+        self.assertIn("Worktree path", result["missing_fields"])
         self.assertIn("Merge result", result["missing_fields"])
 
         complete = self.BASE_HANDOFF + "\n" + "\n".join([
             "- Selected PR: #999",
             "- Reviewer eligibility: passed",
             "- Pinned reviewed head: 0fdc8f582026b72a229d59a172c0a63ac4aaeaf9",
+            "- Worktree path: /repo/branches/review-pr-999",
+            "- Worktree dirty: no",
+            "- Scratch worktree used: yes (/repo/branches/review-pr-999)",
+            "- Unrelated local mutations: none",
             "- Review decision: approve",
             "- Merge result: merged",
             "- Linked issue status: closed",
@@ -1324,6 +1354,13 @@ class TestFinalReport179Bar(unittest.TestCase):
             "controller_handoff": _good_handoff(),
             "capability_proof": _good_capability_proof(),
             "sweep_proof": _good_secret_sweep(),
+            "worktree_proof": {
+                "worktree_path": "/repo/branches/review-feat-issue-224",
+                "porcelain_status": "",
+                "pr_scope_files": ["docs/wiki/Repositories.md"],
+                "scratch_used": True,
+                "scratch_path": "/repo/branches/review-feat-issue-224",
+            },
         }
         kwargs.update(overrides)
         return build_final_report(**kwargs)