feat: implement md/41_INSTRUMENT.md spec
- PianoRollTabService: getParentTrackByItemId, buildActiveScope, getTrackMidiChannel helpers - parent_track_id on all MIDI items for reverse track lookup - handleSwitchMidiItem uses active_scope pattern - Toolbar shows parent track context labels - Channel assignment simplified to trackIndex % 16 - All playNote calls use unified getTrackMidiChannel
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