fix(cron): prevent concurrent cron execution and queue properly

- Add queue-based cron processing in nonInteractiveCli for sequential execution
- Block cron processing while user prompt is active in Session
- Drain cron queue after prompt completion to process queued jobs
- Reduce recurring task auto-expiry from 7 days to 3 days

This fixes race conditions where cron jobs could fire during active prompts
and ensures cron prompts are processed sequentially.

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

packages/core/src/skills/bundled/loop/SKILL.md

@@ -55,7 +55,7 @@ Supported suffixes: `s` (seconds, rounded up to nearest minute, min 1), `m` (min
    - `cron`: the expression from the table above
    - `prompt`: the parsed prompt from above, verbatim (slash commands are passed through unchanged)
    - `recurring`: `true`
-2. Briefly confirm: what's scheduled, the cron expression, the human-readable cadence, that recurring tasks auto-expire after 7 days, and that they can cancel sooner with CronDelete (include the job ID).
+2. Briefly confirm: what's scheduled, the cron expression, the human-readable cadence, that recurring tasks auto-expire after 3 days, and that they can cancel sooner with CronDelete (include the job ID).
 3. **Then immediately execute the parsed prompt now** — don't wait for the first cron fire. If it's a slash command, invoke it via the Skill tool; otherwise act on it directly.
 
 ## Input

packages/core/src/tools/cron-create.test.ts

@@ -33,7 +33,7 @@ describe('CronCreateTool', () => {
     const result = await invocation.execute(new AbortController().signal);
     expect(result.error).toBeUndefined();
     expect(result.llmContent).toContain('Scheduled recurring job');
-    expect(result.llmContent).toContain('Auto-expires after 7 days');
+    expect(result.llmContent).toContain('Auto-expires after 3 days');
     expect(config._scheduler.list()).toHaveLength(1);
   });
 

packages/core/src/tools/cron-create.ts

@@ -52,7 +52,7 @@ class CronCreateInvocation extends BaseToolInvocation<
         llmContent =
           `Scheduled recurring job ${job.id} (${job.cronExpr}). ` +
           'Session-only (not written to disk, dies when Qwen Code exits). ' +
-          'Auto-expires after 7 days. Use CronDelete to cancel sooner.';
+          'Auto-expires after 3 days. Use CronDelete to cancel sooner.';
       } else {
         llmContent =
           `Scheduled one-shot task ${job.id} (${job.cronExpr}). ` +