Fix macOS CI: use macos-15 runner, fix LevelDB permissions

- macos-13 (Intel) runners no longer available, use macos-15 (ARM64)
- chmod +x build_detect_platform before LevelDB build
- Simplify to single ARM64 build for now

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/build-macos.yml

@@ -8,71 +8,7 @@ on:
 
 jobs:
   build-macos:
-    runs-on: macos-13  # Intel runner (x86_64)
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Install dependencies
-        run: |
-          brew install qt@5 openssl@3 boost berkeley-db@5 leveldb libevent miniupnpc
-
-      - name: Build LevelDB
-        run: |
-          cd src/leveldb
-          make clean || true
-          CC=clang CXX=clang++ make OPT="-O2" libleveldb.a libmemenv.a
-
-      - name: Run qmake
-        run: |
-          export PATH="/usr/local/opt/qt@5/bin:$PATH"
-          qmake triangles-qt.pro -spec macx-clang \
-            "BOOST_INCLUDE_PATH=/usr/local/opt/boost/include" \
-            "BOOST_LIB_PATH=/usr/local/opt/boost/lib" \
-            "BDB_INCLUDE_PATH=/usr/local/opt/berkeley-db@5/include" \
-            "BDB_LIB_PATH=/usr/local/opt/berkeley-db@5/lib" \
-            "BDB_LIB_SUFFIX=" \
-            "OPENSSL_INCLUDE_PATH=/usr/local/opt/openssl@3/include" \
-            "OPENSSL_LIB_PATH=/usr/local/opt/openssl@3/lib" \
-            "MINIUPNPC_INCLUDE_PATH=/usr/local/opt/miniupnpc/include" \
-            "MINIUPNPC_LIB_PATH=/usr/local/opt/miniupnpc/lib" \
-            "EVENT_INCLUDE_PATH=/usr/local/opt/libevent/include" \
-            "EVENT_LIB_PATH=/usr/local/opt/libevent/lib" \
-            "RELEASE=1"
-
-      - name: Build
-        run: |
-          export PATH="/usr/local/opt/qt@5/bin:$PATH"
-          make -j$(sysctl -n hw.ncpu)
-
-      - name: Create .app bundle
-        run: |
-          export PATH="/usr/local/opt/qt@5/bin:$PATH"
-          macdeployqt Triangles-Qt.app -verbose=1
-
-      - name: Create DMG
-        run: |
-          mkdir -p dmg_contents
-          cp -R Triangles-Qt.app dmg_contents/
-          ln -s /Applications dmg_contents/Applications
-          hdiutil create -volname "Cryptographic Triangles" \
-            -srcfolder dmg_contents \
-            -ov -format UDZO \
-            "Cryptographic-Triangles-v${{ github.ref_name }}-macos-x64.dmg"
-
-      - name: Upload DMG
-        uses: actions/upload-artifact@v4
-        with:
-          name: macos-dmg
-          path: "*.dmg"
-
-      - name: Upload to Release
-        if: startsWith(github.ref, 'refs/tags/')
-        uses: softprops/action-gh-release@v2
-        with:
-          files: "*.dmg"
-
-  build-macos-arm:
-    runs-on: macos-14  # Apple Silicon runner (ARM64)
+    runs-on: macos-15  # Apple Silicon runner (ARM64)
     steps:
       - uses: actions/checkout@v4
 
@@ -83,6 +19,7 @@ jobs:
       - name: Build LevelDB
         run: |
           cd src/leveldb
+          chmod +x build_detect_platform
           make clean || true
           CC=clang CXX=clang++ make OPT="-O2" libleveldb.a libmemenv.a
 
@@ -121,7 +58,7 @@ jobs:
           hdiutil create -volname "Cryptographic Triangles" \
             -srcfolder dmg_contents \
             -ov -format UDZO \
-            "Cryptographic-Triangles-v${{ github.ref_name }}-macos-arm64.dmg"
+            "Cryptographic-Triangles-macos-arm64.dmg"
 
       - name: Upload DMG
         uses: actions/upload-artifact@v4