Add cron_retrigger for consumed one-shot jobs.

Resume only unpauses; listeners need a native way to re-fire the same job id with a new run without creating duplicate executors.

Co-authored-by: Cursor <cursoragent@cursor.com>

test/tools.test.js

@@ -439,6 +439,7 @@ test('registerCronTools registers each definition and disposer unregisters', ()
     'cron_progress',
     'cron_pause',
     'cron_resume',
+    'cron_retrigger',
     'cron_delete',
   ])
   off()
@@ -454,6 +455,7 @@ test('cron tool output schemas never use type arrays (Host rejects them)', () =>
     async getProgress() { return { snapshots: [], count: 0 } },
     async pauseJob() { return {} },
     async resumeJob() { return {} },
+    async retriggerJob() { return {} },
     async deleteJob() { return {} },
   })
   const bad = []