update SYNC.md — GUI fix pushed, ready for Claude Code pull+build

SYNC.md

@@ -48,9 +48,10 @@ If a plugin crashes → only Helper dies → Ableton survives → UI shows "Relo
 - ✅ Plugin list from filesystem (no binary loading until user selects)
 - ✅ Native pthread priority for audio thread
 - ✅ `NSApplicationActivationPolicyAccessory` for helper (no Dock, no focus steal)
+- ✅ Policy set in main.cpp initialise() BEFORE any windows created
 
 ## Status
-**Last push:** 2026-05-16 — GUI focus-steal fix (Accessory policy + orderFrontRegardless)
-**Build:** ✅ Passes
-**Test:** Plugin loads, audio routes, crash-safe confirmed, GUI toggle works
-**Remaining issue:** Testing GUI float behavior (should stay on top without switching apps)
+**Last push:** 2026-05-16 — Fixed GUI opening as separate app. Root cause: activation policy was only set on the window (showAsFloatingPanel) but not on the NSApplication itself. Fix: added `setActivationPolicy:1` (Accessory) as first line in `initialise()` in main.cpp.
+**Build:** Needs test
+**Test:** Pull, build, load in Ableton → Open GUI → confirm NO Dock icon, NO Cmd+Tab, window floats over Ableton without switching apps.
+**Next:** Sprint 3 — MCP param control from Claude Code (curl tests)