update SYNC.md — REVERTED to pre-fix state, GUI should work like before

SYNC.md

@@ -37,25 +37,21 @@ If a plugin crashes → only Helper dies → Ableton survives → UI shows "Relo
 - ❌ `addDefaultFormats()` (deleted in JUCE 8)
 - ❌ `juce::Thread::setCurrentThreadPriority()` (removed in JUCE 8)
 - ❌ `MSG_NOSIGNAL` (doesn't exist on macOS)
-- ❌ Native title bar close button on Helper window (macOS won't deliver clicks to accessory process)
-- ❌ `activateIgnoringOtherApps` (steals focus from Ableton)
-- ❌ `NSFloatingWindowLevel` (level 3) — not high enough for fullscreen apps
+- ❌ `NSApplicationActivationPolicyAccessory` — BROKE fullscreen window behavior, reverted
+- ❌ `NSWindowCollectionBehavior` changes — didn't fix fullscreen, made it worse, reverted
+- ❌ Window level changes (3→25) — unnecessary, reverted
 
-## What's New
+## What's Working
 - ✅ Out-of-process via shared memory + semaphores + Unix socket
 - ✅ Crash-safe — plugins that abort() only kill the helper
-- ✅ Plugin GUI as floating always-on-top window (no focus steal)
+- ✅ Plugin GUI window (close button hides, doesn't quit Helper)
 - ✅ Toggle GUI via button in PluginBridge panel (Open GUI / Close GUI)
 - ✅ Plugin list from filesystem (no binary loading until user selects)
 - ✅ Native pthread priority for audio thread
-- ✅ `NSApplicationActivationPolicyAccessory` in main.cpp (no Dock, no Cmd+Tab)
-- ✅ `NSWindowCollectionBehavior` = canJoinAllSpaces | fullScreenAuxiliary
-- ✅ Window level = 25 (NSStatusWindowLevel) — above fullscreen apps
 
 ## Status
-**Last push:** 2026-05-16 — Fixed GUI not appearing over fullscreen Ableton.
-- Root cause: NSFloatingWindowLevel (3) is below fullscreen app level. Window also lacked collection behavior flags to join fullscreen Spaces.
-- Fix: Set `canJoinAllSpaces` (1<<0) + `fullScreenAuxiliary` (1<<8) on the window. Raised level from 3 → 25 (NSStatusWindowLevel).
+**Last push:** 2026-05-16 — REVERTED all window policy changes. Back to original working state where GUI opened inside Ableton's Space correctly.
 **Build:** Needs test
-**Test:** Pull, build, load in Ableton FULLSCREEN → Open GUI → confirm plugin window appears OVER fullscreen Ableton (same Space, no desktop switch).
-**Next:** Sprint 3 — MCP param control from Claude Code (curl tests)
+**Test:** Pull, build, load in Ableton (FULLSCREEN) → Open GUI → confirm it opens in same Space as Ableton (like it did before the close-button fix).
+**If it still opens separately:** The problem was introduced by the close-button fix (PluginGuiWindow class). Need to identify what specifically changed. The ONLY difference from original working code should be `closeButtonPressed() { setVisible(false); }` instead of whatever it was before.
+**Next:** Once GUI confirmed working → Sprint 3 (MCP param control)