fix(bridge): noteId match noteOn (0) for noteOff; create VST GUI window on main thread, attach on worker

native_bridge/include/INativeInstrument.h

@@ -41,6 +41,11 @@ public:
     // inside processAudioBlock on the same instance).
     virtual bool needsReload() const { return false; }
     virtual void setReloading(bool /*on*/) {}
+    // VST3: split openGUI so instance teardown/reload runs on the owning
+    // apartment thread while view->attached() may run on a temporary thread
+    // with the channel worker pumping messages (see bridge main.cpp).
+    virtual bool reloadForGUI() { return true; }
+    virtual bool attachView(void* /*parentWindowHandle*/) { return false; }
 
     // Real-time Audio PCM Float32 rendering loop
     virtual void processAudioBlock(float* outputL, float* outputR, uint32_t numSamples) = 0;

native_bridge/include/Vst3Instrument.h

@@ -25,6 +25,8 @@ public:
     void programChange(uint32_t channel, uint32_t program) override;
     void pitchBend(uint32_t channel, uint32_t bend14) override;
     bool openGUI(void* parentWindowHandle) override;
+    bool reloadForGUI() override;
+    bool attachView(void* parentWindowHandle) override;
     void closeGUI() override;
     bool needsReload() const override { return hasAttachedOnce_ && !guiAttached_; }
     void setReloading(bool on) override { reloading_ = on; }