feat(KB-045): add scheduled tasks automation system

- Add AutomationStore and core automation types for cron-based scheduling
- Implement CronRunner engine for executing scheduled automations
- Add REST API routes for CRUD operations on automations
- Create UI components: ScheduleCard, ScheduleForm, and ScheduledTasksModal
- Integrate scheduled tasks into dashboard App.tsx and CLI dashboard command
- Add comprehensive tests for store, runner, API, and UI components
- Include changeset for the new scheduled tasks feature

packages/core/package.json

@@ -30,5 +30,8 @@
     "typescript": "^5.7.0",
     "vitest": "^3.1.0"
   },
-  "private": true
+  "private": true,
+  "dependencies": {
+    "cron-parser": "^5.5.0"
+  }
 }