- Add video, still, and procedural three-tier portrait system for all 10 species
- Add species-specific speech clips and UI voiceover (SpeechQueue integration)
- Add landing screen with New Game / Resume / Return to Arcade buttons
- Add species detail pop-over with animated expand/collapse and auto-introduction
- Add game-specific soundtrack (masterofvega-music.json, 4 tracks)
- Add video asset type support in assetLoader and PreloadScene
- Add portraitVideos and portraitStills sections to artwork manifest
- Add verification for portraits, speech clips, and music tracks
- Update sprites.md with documentation for new assets and filenames
