refactor: improve logger output and add file change notifications

- Add phase(), step(), fileChange() methods to Logger
- Filter noisy events (message.part.updated, session.updated, etc.)
- Add file change notifications for file.edited, file.created, file.deleted
- Update EventLogger interface with new methods
- Add comprehensive tests for builder and logger

Signed-off-by: leocavalcante <[email protected]>

Author: leocavalcante