Update .gitignore and remove obsolete cleanup documentation - Added `.gradio` and `tests/data/cache` to `.gitignore` to prevent unnecessary file tracking. Deleted outdated cleanup documentation files (`AGENT_CLEANUP_COMPLETION.md` and `CLEANUP_PLAN.md`) to streamline the codebase and remove obsolete references. This cleanup supports ongoing refactoring efforts and enhances overall project maintainability.

Remove obsolete test files and refactor agent imports - Deleted unused test files for `test_fix.py` and `test_smart_context.py`. Updated agent imports in `__init__.py` and other files to streamline the codebase and improve maintainability. This cleanup supports ongoing refactoring efforts and enhances the overall structure of the project.