Initial FocusFixer implementation

Menu-bar utility that fixes cross-display keyboard focus loss: a
listen-only CGEvent tap locates the window under the cursor and
reasserts app activation + AX focus on it, with debounce, tap
auto-recovery, and an Accessibility permission gate.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

FocusFixer/main.swift

@@ -0,0 +1,6 @@
+import AppKit
+
+let app = NSApplication.shared
+let delegate = AppDelegate()
+app.delegate = delegate
+app.run()