chore: remove internal planning files from repo

- Remove IDEAS.md and TODO.md from tracking
- Add to .gitignore to prevent future commits

Author: DevanshuNEU

.gitignore

@@ -38,3 +38,7 @@ mcp-server/__pycache__/
 # Validation experiments
 validation-experiment/
 exp-2/
+
+# Internal planning
+IDEAS.md
+TODO.md