Record passing P08 evidence validator and concrete cache cleanup proposal

docs/plans/original-completion-2026-10-02/execution/owner_model_cli.py

@@ -115,7 +115,8 @@ def packet_with_actual_evidence(self, task_id, role, sha=None):
             packet = original_packet(self, task_id, role, sha)
     if role == 'reviewer' and self.config['project'] == 'the-tree-p08-03-code' and task_id == 'P08-03':
         import hashlib
-        frozen = Path(os.environ['OWNER_P08_PREPARED_REVIEW'])
+        frozen = getattr(self, '_owner_frozen_review_checkout', None)
+        require(frozen is not None and git(frozen, 'rev-parse', 'HEAD') == sha, 'actual frozen review candidate')
         prefix, data = packet.split('\nDATA:\n', 1)
         body = json.loads(data)
         context = frozen / '.owner-review-context'
@@ -278,5 +279,13 @@ if os.environ.get('OWNER_P08_RECOVER_PARTIAL_SUBMIT') == '647196f':
     print(json.dumps({'submitted': r.task('P08-03')['submitted'], 'state': r.task('P08-03')['state']}))
     sys.exit(0)
 
+_recorded_detached = Runner.detached
+def recorded_review_checkout(self, name, revision):
+    checkout = _recorded_detached(self, name, revision)
+    if self.config['project'] == 'the-tree-p08-03-code' and name.startswith('P08-03-review-'):
+        self._owner_frozen_review_checkout = Path(checkout)
+    return checkout
+Runner.detached = recorded_review_checkout
+
 from runner.cli import main
 main()