fix(codex): resolve peer-review findings R1-R6 and T1-T2

- R1: use herdr send-keys C-c for graceful stop
- R2: preserve JSONL fallback discovery when database is empty
- R3: apply workspace-scoped SQLite query before bounding results
- R4: tighten artifact validation to fail closed on missing/invalid metadata
- R5: verify actual rollout presence before reporting resumable in status
- R6: remove unconditional drift-B backend command fallback
- T1: parameterize artifact metadata regression with verified finder fixture
- T2: seed unmanaged and managed sessions in mock herdr for drift-B testing
- Add final loop review reports (100% PASS)

tests/test_tier2_component.py

@@ -1252,6 +1252,8 @@ def test_comp_opencode_create_and_reconcile_and_stop(mam_sandbox, mock_herdr, mo
     # Run reconcile.sh to trigger drift-C materialization
     reconcile_script = mam_sandbox / ".agents" / "skills" / "multi-agent-mux-monitor" / "scripts" / "reconcile.sh"
     res_rec = subprocess.run(["bash", str(reconcile_script), "--once", "--emit-diff"], capture_output=True, text=True, cwd=str(mam_sandbox), env={**os.environ, "WORKSPACE_ROOT": str(mam_sandbox)})
+    print("RECONCILE STDOUT:\n", res_rec.stdout)
+    print("RECONCILE STDERR:\n", res_rec.stderr)
     assert res_rec.returncode == 0, res_rec.stderr
 
     with open(yaml_path) as f: