feat(FN-1269): complete routine engine integration with RoutineRunner and RoutineScheduler

- Add RoutineRunner class for routine execution via heartbeat system
- Add RoutineScheduler class for cron-based routine polling
- Add triggerManual and triggerWebhook methods for API and webhook triggers
- Wire RoutineScheduler into InProcessRuntime lifecycle
- Add routine trigger and webhook API endpoints
- Fix type mismatches between PROMPT and actual FN-1519 types

packages/engine/package.json

@@ -26,7 +26,8 @@
     "@fusion/core": "workspace:*",
     "@mariozechner/pi-ai": "^0.62.0",
     "@mariozechner/pi-coding-agent": "^0.62.0",
-    "@sinclair/typebox": "^0.34.48"
+    "@sinclair/typebox": "^0.34.48",
+    "cron-parser": "^5.5.0"
   },
   "devDependencies": {
     "@modelcontextprotocol/sdk": "^1.0.0",