feat: add background agents with scheduling support

- Add background task scheduling system with cron-based triggers
- Add background-task-detail component for viewing agent status
- Add agent schedule repo and state management
- Update sidebar to show background agents section
- Remove old workflow-authoring and workflow-run-ops skills
- Add IPC handlers for agent schedule operations

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/x/packages/core/package.json

@@ -12,9 +12,9 @@
     "@ai-sdk/anthropic": "^2.0.44",
     "@ai-sdk/google": "^2.0.25",
     "@ai-sdk/openai": "^2.0.53",
-    "@composio/core": "^0.6.0",
     "@ai-sdk/openai-compatible": "^1.0.27",
     "@ai-sdk/provider": "^2.0.0",
+    "@composio/core": "^0.6.0",
     "@google-cloud/local-auth": "^3.0.1",
     "@modelcontextprotocol/sdk": "^1.25.1",
     "@openrouter/ai-sdk-provider": "^1.2.6",
@@ -24,6 +24,7 @@
     "ai": "^5.0.102",
     "awilix": "^12.0.5",
     "chokidar": "^4.0.3",
+    "cron-parser": "^5.5.0",
     "glob": "^13.0.0",
     "google-auth-library": "^10.5.0",
     "googleapis": "^169.0.0",