feat(cron): add in-session loop scheduling with cron tools

Add session-scoped recurring jobs that fire while you work. Jobs live
inside the current Qwen Code process and are gone when you exit.

New tools:
- cron_create: schedule a prompt to run on a cron expression
- cron_list: list active cron jobs
- cron_delete: cancel a scheduled job

Components:
- CronScheduler service for in-process job management
- cronParser utility for 5-field cron expressions
- /loop skill for natural language scheduling
- Non-interactive mode integration to keep process alive

Constraints:
- Max 50 jobs per session
- 3-day expiry for recurring jobs
- Jitter to prevent thundering herd
- No catch-up for missed fire times

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packages/cli/src/ui/hooks/useGeminiStream.ts

@@ -1638,6 +1638,32 @@ export const useGeminiStream = (
     storage,
   ]);
 
+  // ─── Cron scheduler integration ─────────────────────────
+  const cronQueueRef = useRef<string[]>([]);
+
+  // Start the scheduler on mount, stop on unmount
+  useEffect(() => {
+    if (config.isCronDisabled()) return;
+    const scheduler = config.getCronScheduler();
+    scheduler.start((job: { prompt: string }) => {
+      cronQueueRef.current.push(job.prompt);
+    });
+    return () => {
+      scheduler.stop();
+    };
+  }, [config]);
+
+  // When idle, drain the cron queue one prompt at a time
+  useEffect(() => {
+    if (
+      streamingState === StreamingState.Idle &&
+      cronQueueRef.current.length > 0
+    ) {
+      const prompt = cronQueueRef.current.shift()!;
+      submitQuery(prompt, SendMessageType.UserQuery);
+    }
+  }, [streamingState, submitQuery]);
+
   return {
     streamingState,
     submitQuery,