T4: UnifiedMidiRouter - 1 diem dispatch MIDI moi nguon
UnifiedMidiEvent (trackId, channel, command, pitch clamp 0-127, velocity
normalize float->int 1-127, sourceType, timestampNs) + UnifiedMidiRouter:
engineRegistry Map<trackId, engine> (route theo track), dispatchMidiEvent,
activeVoiceTracker key trackId_channel_pitch (dem note-on/off dung - het
stuck notes, note-off cuoi moi tat voice), panicAllNotesOff. Chua noi
vao app (T5-T7). Test node: pitch clamp, velocity normalize, tracker,
panic clear - xanh.
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