feat: implement music extension with sample-based audio playback#402
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Play drums and instrument notes using MP3 samples from scratch-vm. Bundle 61 MP3 files (18 drums + 43 instrument samples) in assets/music/. Uses SDL2::Mixer for audio playback with 16 channels. - play_drum: loads drum MP3 and plays via SDL2::Mixer - play_note: selects closest sample for target note, plays via SDL2::Mixer - Instrument/tempo management matching Scratch - Allocate 16 mixer channels on init Closes #391 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Music 拡張で実際にドラム・楽器の音声を再生。
assets/music/にバンドルplay_drum: ドラム番号に対応するサンプルを再生play_note: 楽器の最適サンプルを選択して再生（Scratch と同じ_selectSampleIndexForNoteロジック）SDL2::Mixer::Channels.allocate(16)）テスト
cd ruby/smalruby3 ../rsdl/rsdl -I../ruby-sdl2 -I../ruby-sdl2/lib -Ilib examples/test_music.rbCloses #391
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