feat(session): persist model tier overrides per session

Store per-session config in SQLite and route /model and /reset through command fast-paths so channel sessions keep independent model selection across reconnects and restarts.

src/automation/cron.ts

@@ -161,9 +161,9 @@ export class CronScheduler implements ChannelAdapter {
     }
 
     this.jobs.delete(name);
-    
+
     auditLogger?.cronRemove(name);
-    
+
     return true;
   }
 }