chore: remove notes folder from git tracking

- Remove notes/ directory from git history while preserving local files
- Update .gitignore to properly exclude notes folder
- Keep development notes local-only for better repository hygiene

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: sidmohan0

.gitignore

@@ -64,4 +64,5 @@ docs/*
 # Keep all files but ignore their contents
 Claude.md
 notes/benchmarking_notes.md
-Roadmap.md
+Roadmap.md
+notes/*