v0.9.0 - Persistent Cache & Cache Management

Added

• Persistent work_dir default: Default work_dir now uses platform-appropriate cache directory:
  • Linux: ~/.cache/audiorag
  • macOS: ~/Library/Caches/audiorag
  • Windows: %LOCALAPPDATA%\audiorag
• Cache management CLI: New commands to manage cached audio files:
  • audiorag cache info - Show cache location and size
  • audiorag cache clear - Clear all cached audio files
• Cache management SDK: New methods on AudioRAGPipeline:
  • pipeline.clear_cache() - Clear cache, returns count of items removed
  • pipeline.get_cache_info() - Get cache location, file count, and size

Fixed

• Type safety: Fixed type checking for metadata.duration attribute access in budget reservation logic.