Two guards: schedulePianoRollMidi skips native SF item scheduling while bridge is active; scheduleMidiNoteDispatch lets notes pass to the MIDI router when a piano-roll sub-tab is playing. Verified on Windows: SF2 peak 0.026, VST3 ACDD native GUI + peak 0.074 via Play button. Docs: TEST_NOTES.md, TASKS.md.
- bridgeAudioNode: ScriptProcessor 4096 drained only 1 of 16 blocks -> ~94% silence; now drains all queued blocks per callback, RING_DEPTH 8->24
- app.jsx: openNativeGUI had NO caller; wire after VST3 loadInstrument OK in track Synth dropdown + Plugin Manager Load Bridge
- main.cpp: OPEN_GUI polls up to 10s for LOAD completion (worker thread) before attach - fixes race 'no instrument loaded'
- index.html: bump bridgeAudioNode/app.precompiled cache versions