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>

project.yml

@@ -0,0 +1,53 @@
+name: FocusFixer
+options:
+  minimumXcodeGenVersion: "2.38.0"
+configs:
+  Debug: debug
+  Release: release
+settings:
+  base:
+    SWIFT_VERSION: "5.9"
+    MACOSX_DEPLOYMENT_TARGET: "13.0"
+    CODE_SIGN_STYLE: Automatic
+    ENABLE_HARDENED_RUNTIME: NO
+targets:
+  FocusFixer:
+    type: application
+    platform: macOS
+    deploymentTarget: "13.0"
+    sources:
+      - path: FocusFixer
+        excludes:
+          - Info.plist
+    settings:
+      base:
+        PRODUCT_NAME: FocusFixer
+        PRODUCT_BUNDLE_IDENTIFIER: com.local.focusfixer
+        INFOPLIST_FILE: FocusFixer/Info.plist
+        GENERATE_INFOPLIST_FILE: NO
+  FocusFixerTests:
+    type: bundle.unit-test
+    platform: macOS
+    deploymentTarget: "13.0"
+    sources:
+      - path: FocusFixerTests
+    dependencies:
+      - target: FocusFixer
+    settings:
+      base:
+        GENERATE_INFOPLIST_FILE: YES
+        BUNDLE_LOADER: "$(TEST_HOST)"
+        TEST_HOST: "$(BUILT_PRODUCTS_DIR)/FocusFixer.app/Contents/MacOS/FocusFixer"
+schemes:
+  FocusFixer:
+    build:
+      targets:
+        FocusFixer: all
+        FocusFixerTests: [test]
+    run:
+      config: Debug
+    test:
+      config: Debug
+      gatherCoverageData: false
+      targets:
+        - FocusFixerTests