feat(macos): add code signing and notarization support

Add macOS code signing and notarization for Gatekeeper compatibility:

- Add hardened runtime configuration in package.json
- Add entitlements.mac.plist for required app permissions
- Enable built-in electron-builder notarization
- Add code signing and notarization secrets to workflow

Required GitHub Secrets:
- CSC_LINK: Base64-encoded .p12 certificate file
- CSC_KEY_PASSWORD: Password for the .p12 certificate
- APPLE_ID: Apple Developer account email
- APPLE_APP_SPECIFIC_PASSWORD: App-specific password from appleid.apple.com
- APPLE_TEAM_ID: 10-character Apple Developer Team ID

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -38,6 +38,14 @@ jobs:
       - run: npm ci
 
       - name: Build macOS Packages
+        env:
+          # Code signing
+          CSC_LINK: ${{ secrets.CSC_LINK }}
+          CSC_KEY_PASSWORD: ${{ secrets.CSC_KEY_PASSWORD }}
+          # Notarization
+          APPLE_ID: ${{ secrets.APPLE_ID }}
+          APPLE_APP_SPECIFIC_PASSWORD: ${{ secrets.APPLE_APP_SPECIFIC_PASSWORD }}
+          APPLE_TEAM_ID: ${{ secrets.APPLE_TEAM_ID }}
         run: npx electron-builder --mac --publish never
       - uses: actions/upload-artifact@v4
         with:
@@ -45,6 +53,7 @@ jobs:
           path: |
             dist/*.dmg
             dist/*.zip
+            dist/*.blockmap
             dist/latest-mac.yml
 
   build-linux:

build/entitlements.mac.plist

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.cs.allow-jit</key>
+    <true/>
+    <key>com.apple.security.cs.allow-unsigned-executable-memory</key>
+    <true/>
+    <key>com.apple.security.cs.disable-library-validation</key>
+    <true/>
+    <key>com.apple.security.network.client</key>
+    <true/>
+    <key>com.apple.security.network.server</key>
+    <true/>
+    <key>com.apple.security.files.user-selected.read-write</key>
+    <true/>
+</dict>
+</plist>

package.json

@@ -104,7 +104,12 @@
       ],
       "icon": "build/icon.icns",
       "artifactName": "${name}_${version}_${arch}.${ext}",
-      "category": "public.app-category.games"
+      "category": "public.app-category.games",
+      "hardenedRuntime": true,
+      "gatekeeperAssess": false,
+      "entitlements": "build/entitlements.mac.plist",
+      "entitlementsInherit": "build/entitlements.mac.plist",
+      "notarize": true
     },
     "nsis": {
       "oneClick": false,