feat(audio): sound effects, BGM, volume and procedural synth#91

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xinyao27 wants to merge 9 commits into

pocket-stack:mainfrom

xinyao27:feat/audio

Commits on Jul 12, 2026

docs(audio): specify the audio surface, API and asset pipeline
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feat(audio): spec ops 26-31 and runtime API (@pocketjs/framework/audio)
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feat(audio): bake WAV files into SND pak entries via sounds.json
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feat(audio): WebAudio host with gesture unlock and synth pre-render
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feat(audio): record the audio command stream in the sim host trace
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feat(audio): PSP software mixer thread behind globalThis.audio
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fix(audio): widen PCM cursor to u64 and make fade ramps click-free
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docs(audio): pin loopStart units to the baked sample rate
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feat(audio): wire the music and settings demos with baked chiptune BGM
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