- add npm dev:hot wrapper using cargo-watch and page reload polling
- add mnote-web dev hot reload endpoint and coverage
- record current architecture review and tracked bug findings across realtime, tree, editor, and AI runtimes
Verification:
- node scripts/task-dev-hot-plan-test.js
- node --check scripts/dev-hot.js
- cargo test -p mnote-web dev_hot -- --nocapture