fix(issue-57): review nits - a damaged audit sequence or an unresolvable log root never aborts the check

_check_disk_fallback converted transition_seq outside its try, so a
status.json whose sequence is not an integer would raise out of the
subscriber's main loop; such a status is now ignored with a warning, like a
stale one. delegate_started_recorded returned 1 before looking at the
registry's events.log when the audit-log root could not be resolved; it now
skips only the audit check.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.agents/skills/lib_py/delegation/job_subscriber.py

@@ -110,7 +110,11 @@ def _check_disk_fallback(
                 # ignores it. An unversioned record (never transitioned, or
                 # MAM_ENGINE_CAS=0) and a missing record keep the old rule.
                 aud_seq = logged.get("transition_seq")
-                if rec_seq is not None and (aud_seq is None or int(aud_seq) < int(rec_seq)):
+                try:
+                    stale = rec_seq is not None and (aud_seq is None or int(aud_seq) < int(rec_seq))
+                except (TypeError, ValueError):
+                    stale = True  # a damaged status.json proves nothing either
+                if stale:
                     logger.warning("disk fallback ignored audit status %r for %s: transition_seq %r is older "
                                    "than the record's %r", logged.get("status"), jid, aud_seq, rec_seq)
                 else: