COMPLETE REWRITE to proper solution:
- Plugin runs in Helper process (crash-safe, like v0.2)
- GUI renders in Helper via CARemoteLayerServer
- PluginBridge.vst3 displays it via CARemoteLayerClient (CALayer inside its own editor)
- Mach port transferred via NSMachBootstrapServer (named port per PID)
- Mouse/keyboard events forwarded from host → helper via Unix socket IPC
- Audio routes via shared memory (same as v0.2)
This gives BOTH crash safety AND GUI inside Ableton's window (including fullscreen).
Based on: Apple's CARemoteLayerServer/Client public API (macOS 10.7+)
Reference: krevis/RemoteLayerDemo on GitHub"
Out-of-process rebuild: Add Shared/IPCProtocol.h — message definitions for parent↔helper IPC
