- Update `wrangler.jsonc` to correct the `CUSTOM_AGENT_WEBHOOK` URL.
- Enhance `page.tsx` to load custom agents from localStorage and merge them with predefined agents.
- Modify `route.ts` to validate `systemPrompt` for custom agents and include it in the webhook payload.
- Adjust `chat-interface.tsx` to handle custom agents more effectively, including system prompt integration and event dispatching for pinned agents.
- Remove obsolete `CUSTOM_AGENT_EXECUTION_PRD.md` and `DIFF_TOOL_USAGE.md` files as part of cleanup.