fix(cron): pass session_db to AIAgent so cron messages are persisted

Cron jobs create AIAgent without passing session_db, so messages from
cron runs (and their delegate_task subagents) are never written to the
SQLite session store. This means session_search cannot find any cron
conversation history — the same class of bug fixed for the gateway in
8aa531c (PR #105).

Initialize SessionDB in run_job() and pass it to AIAgent, following the
identical pattern used in gateway/run.py.

cron/scheduler.py

@@ -156,6 +156,15 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
     """
     from run_agent import AIAgent
     
+    # Initialize SQLite session store so cron job messages are persisted
+    # and discoverable via session_search (same pattern as gateway/run.py).
+    _session_db = None
+    try:
+        from hermes_state import SessionDB
+        _session_db = SessionDB()
+    except Exception as e:
+        logger.debug("Job '%s': SQLite session store not available: %s", job.get("id", "?"), e)
+    
     job_id = job["id"]
     job_name = job["name"]
     prompt = job["prompt"]
@@ -260,7 +269,8 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
             providers_order=pr.get("order"),
             provider_sort=pr.get("sort"),
             quiet_mode=True,
-            session_id=f"cron_{job_id}_{_hermes_now().strftime('%Y%m%d_%H%M%S')}"
+            session_id=f"cron_{job_id}_{_hermes_now().strftime('%Y%m%d_%H%M%S')}",
+            session_db=_session_db,
         )
         
         result = agent.run_conversation(prompt)