fix: show plugin GUI in-process (inside Ableton window) not from Helper

ROOT CAUSE: Moving GUI to Helper process broke it. macOS treats Helper
as separate app → opens in different Space when fullscreen.

SOLUTION: PluginBridge.vst3 (in-process) loads a GUI-only plugin instance.
This instance doesn't process audio — it's only for displaying the editor.
Ableton manages it as a normal plugin window (same as Pro-Q 4 native).

Parameter sync: GUI instance ↔ Helper via IPC (bidirectional).
- User moves knob on GUI → notify Helper → Helper updates real instance
- MCP/automation changes param on Helper → notify Plugin → update GUI instance

Helper no longer shows any GUI window.

Source/Helper/HelperPluginHost.cpp

@@ -4,66 +4,6 @@
 #include <pthread.h>
 #include <sched.h>
 
-#if JUCE_MAC
-#include <objc/objc.h>
-#include <objc/message.h>
-#endif
-
-// Configure window for floating-panel behavior that works in fullscreen
-// MUST be called BEFORE the window is made visible
-static void configureAsOverlayPanel(juce::Component* window)
-{
-#if JUCE_MAC
-    if (auto* peer = window->getPeer())
-    {
-        auto* nsWindow = (id)peer->getNativeHandle();
-
-        // --- COLLECTION BEHAVIOR (MUST be set before visible) ---
-        // canJoinAllSpaces       = 1 << 0   (appear on all desktops/spaces)
-        // fullScreenAuxiliary    = 1 << 8   (can appear over fullscreen apps)
-        // stationary             = 1 << 4   (don't move with space switches)
-        // ignoresCycle           = 1 << 6   (skip in Cmd+` cycling)
-        long behavior = (1 << 0) | (1 << 8) | (1 << 4) | (1 << 6);
-        ((void(*)(id, SEL, long))objc_msgSend)(nsWindow, sel_registerName("setCollectionBehavior:"), behavior);
-
-        // --- WINDOW LEVEL ---
-        // Level 25 = NSStatusWindowLevel (above fullscreen apps)
-        ((void(*)(id, SEL, long))objc_msgSend)(nsWindow, sel_registerName("setLevel:"), 25);
-
-        // Don't hide when the helper app loses focus
-        ((void(*)(id, SEL, int))objc_msgSend)(nsWindow, sel_registerName("setHidesOnDeactivate:"), 0);
-    }
-#endif
-}
-
-// Make the window appear without stealing focus (call AFTER visible)
-static void showWithoutFocusSteal(juce::Component* window)
-{
-#if JUCE_MAC
-    if (auto* peer = window->getPeer())
-    {
-        auto* nsWindow = (id)peer->getNativeHandle();
-        ((void(*)(id, SEL))objc_msgSend)(nsWindow, sel_registerName("orderFrontRegardless"));
-    }
-#endif
-}
-
-// Custom window — no native title bar close issues with accessory policy
-class PluginGuiWindow : public juce::DocumentWindow
-{
-public:
-    PluginGuiWindow(const juce::String& name)
-        : DocumentWindow(name, juce::Colour(0xff1a1a2e), DocumentWindow::allButtons, true)
-    {
-        setUsingNativeTitleBar(true);
-    }
-
-    void closeButtonPressed() override
-    {
-        setVisible(false);
-    }
-};
-
 HelperPluginHost::HelperPluginHost()
 {
     #if JUCE_PLUGINHOST_VST3
@@ -77,7 +17,6 @@ HelperPluginHost::HelperPluginHost()
 HelperPluginHost::~HelperPluginHost()
 {
     stopProcessing();
-    hideGui();
     unloadPlugin();
 }
 
@@ -137,7 +76,6 @@ bool HelperPluginHost::loadPlugin(const juce::String& path, double sampleRate, i
 
 void HelperPluginHost::unloadPlugin()
 {
-    hideGui();
     if (plugin)
     {
         plugin->releaseResources();
@@ -282,54 +220,19 @@ bool HelperPluginHost::setParams(const std::map<int, float>& values)
 }
 
 // --- GUI ---
+// GUI is NO LONGER handled by the Helper process.
+// It's now handled in-process by PluginBridgeEditor (inside Ableton).
+// These stubs remain for IPC compatibility but do nothing.
 
 void HelperPluginHost::showGui()
 {
-    if (!plugin || !plugin->hasEditor()) return;
-
-    juce::MessageManager::callAsync([this]()
-    {
-        if (!plugin) return;
-
-        // If window exists but hidden, just show it
-        if (guiWindow)
-        {
-            // Re-apply overlay config before showing (in case Space changed)
-            configureAsOverlayPanel(guiWindow.get());
-            guiWindow->setVisible(true);
-            showWithoutFocusSteal(guiWindow.get());
-            return;
-        }
-
-        auto* editor = plugin->createEditor();
-        if (!editor) return;
-
-        guiWindow = std::make_unique<PluginGuiWindow>(plugin->getName());
-        guiWindow->setContentOwned(editor, true);
-        guiWindow->setResizable(true, true);
-        guiWindow->centreWithSize(editor->getWidth(), editor->getHeight());
-
-        // CRITICAL: configure overlay behavior BEFORE making visible
-        configureAsOverlayPanel(guiWindow.get());
-
-        // NOW make visible
-        guiWindow->setVisible(true);
-
-        // Show without stealing focus from Ableton
-        showWithoutFocusSteal(guiWindow.get());
-    });
+    // No-op — GUI is shown in-process by PluginBridgeEditor
+    DBG("HelperPluginHost::showGui() — no-op, GUI is in-process now");
 }
 
 void HelperPluginHost::hideGui()
 {
-    if (guiWindow)
-    {
-        juce::MessageManager::callAsync([this]()
-        {
-            if (guiWindow)
-                guiWindow->setVisible(false);
-        });
-    }
+    // No-op
 }
 
 // --- State ---