Add bun link support for local CLI development

[codythatsme]

Hey! No pressure to merge this. This is just a change I made to allow local development easier for me on my fork, and thought I would share incase this might be valuable.

This approach inspired from ghui doing the same thing: https://github.com/kitlangton/ghui

Local development/personal forks made super easy by just running bun link in a clone.

Summary

• Added a plannotator bin entry so the CLI can be linked from this checkout with bun link.
• Introduced a small Node wrapper that resolves the local apps/hook/server/index.ts entrypoint and forwards CLI args to Bun.
• Documented the local development workflow in the README, including when to rebuild bundled HTML after UI changes.