Remove obsolete phase completion summaries and demo test scripts - Deleted `PHASE1_COMPLETION_SUMMARY.md`, `PHASE2_COMPLETION_SUMMARY.md`, `PHASE3_COMPLETION_SUMMARY.md`, and associated demo test scripts to streamline the codebase and eliminate unused documentation. This cleanup supports ongoing refactoring efforts and enhances overall project maintainability.

Add autopep8 as a dependency for code formatting - Updated pyproject.toml to include autopep8 version 2.3.2 for improved code style consistency. Modified uv.lock to reflect the new dependency and its requirements. This update aims to enhance code maintainability and adherence to style guidelines.

Enhance intent-aware recommendation system design and scoring logic - Updated the design document to introduce a new query type for "by artist" intent, detailing user goals, scoring strategies, and agent workflows. Refactored scoring logic in the quality scorer and ranking logic to accommodate exploration preferences and artist alias handling. Improved candidate generation for artist-specific queries and refined genre filtering methods to support hybrid queries. This update aims to better align system behavior with user intent and enhance overall recommendation accuracy.

Update configuration files and remove obsolete test scripts - Increased line length limit in `pyproject.toml`, `test_hybrid_intent_final.py`, `test_hybrid_intent_fix.py`, `test_hybrid_subtypes.py`, `test_intent_fix.py`, `test_quick_hybrid.py`, `test_ui_improvements.py` to enhance code formatting flexibility. Deleted unused test files to streamline the codebase and improve maintainability. This cleanup supports ongoing refactoring efforts and enhances overall project structure.

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 Deleted outdated cleanup documentation files (`AGENT_CLEANUP_COMPLETION.md` and `CLEANUP_PLAN.md`) to streamline the codebase and remove obsolete references.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.

Enhance UnifiedTrackMetadata and Services Module - Added recommendation-specific fields and audio features to UnifiedTrackMetadata for improved track metadata handling. Updated services module to include enhanced API and recommendation services, streamlining workflows and maintaining backward compatibility.