Retain attended preflight failure diagnostics before a safe retry

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a09cbb-87c6-7900-a145-4ce53ba9f1a6

docs/evidence/2026-09-14-t03-attended-delivery-attempt-01.json

@@ -0,0 +1,9 @@
+{
+  "observed_at": "2026-09-14T01:32:22.293884+00:00",
+  "status": "failed",
+  "phase": "scoped_reader_delivered",
+  "credential_values_emitted": false,
+  "reader_effective_policy_verified": true,
+  "existing_kv_version": 1,
+  "failure_code": "attended_admin_failed"
+}

scripts/t03-native-execution.py

@@ -124,6 +124,9 @@ def admin(directory,negative):
   receipt['health_after']=health();receipt['status']='passed';receipt['phase']='all_actions_completed'
  except Exception as exc:
   receipt['failure_type']=type(exc).__name__
+  import traceback
+  frame=traceback.extract_tb(exc.__traceback__)[-1]
+  receipt['failure_location']=frame.filename+':'+str(frame.lineno)
   # Only explicit local codes are eligible; no backend exception text is exported.
   if type(exc) is ValueError and str(exc).replace('_','').isalnum():receipt['failure_code']=str(exc)
   raise