docs: update readme

README.md

@@ -190,6 +190,14 @@ Technical details live in the `docs/` folder:
 - **[docs/ARCHITECTURE.md](docs/ARCHITECTURE.md)** — system design, module map, task layout, memory budget, protocols, flash partitions
 - **[docs/TODO.md](docs/TODO.md)** — feature gap tracker and roadmap
 
+## Contributing
+
+Please read **[docs/CONTRIBUTE.md](docs/CONTRIBUTE.md)** before opening issues or pull requests.
+
+## Changelog
+
+See **[docs/CHANGELOG.md](docs/CHANGELOG.md)** for release notes and notable changes.
+
 ## License
 
 MIT