fix(delegation): audit-log root follows the registry (Issue #57)

get_logs_dir(registry_dir) resolves the audit-log root as the
delegate_job_logs next to the registry in use when DELEGATE_JOB_LOGS_DIR
is not set; sibling_logs_dir() is the pure sibling rule. Every writer and
reader that knows its registry (registry, engine, publish_event, remote,
job_subscriber, reconcile.sh, the loop runner's fingerprint exclusion)
passes that root instead of falling back to the workspace default.

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

.agents/skills/lib_py/delegation/engine.py

@@ -374,13 +374,14 @@ def _flush(notifications, registry_dir) -> None:
     Best effort by design: the registry record is already durable, and an audit
     write must never be able to fail a transition that has committed.
     """
+    logs_dir = mqtt_common.get_logs_dir(registry_dir)
     for note in notifications:
         job_id = note["job_id"]
         kind = note["kind"]
         try:
             if kind == "status_changed":
                 mqtt_common.update_logged_status(
-                    job_id, note["to"], updated_at=note.get("timestamp"),
+                    job_id, note["to"], logs_dir=logs_dir, updated_at=note.get("timestamp"),
                     transition_seq=note.get("transition_seq"))
                 mqtt_common.append_event(job_id, {
                     "event": "status_changed",
@@ -389,7 +390,7 @@ def _flush(notifications, registry_dir) -> None:
                     "by": note.get("by"),
                     "timestamp": note.get("timestamp"),
                     "transition_seq": note.get("transition_seq"),
-                })
+                }, logs_dir=logs_dir)
             elif kind == "conflict_refused":
                 mqtt_common.append_event(job_id, {
                     "event": "conflict_refused",