Pin Xcode 26.0.1 for release and broaden SPM cache clear

Xcode 26.2 (the new default on macos-26) hits a SwiftPM race where
binary xcframework downloads fail with "already exists in file system".
Xcode 26.0.1 — the toolchain the last successful release ran against —
resolved the same deps cleanly. Also download the iOS platform if the
runner image only ships the platform bundled with the default Xcode,
and clear SPM cache more broadly rather than only the artifacts dir.

.github/workflows/release.yml

@@ -39,8 +39,18 @@ jobs:
         run: |
           sed -i '' 's/match Development/match AppStore/' Yattee.xcodeproj/project.pbxproj
           sed -i '' 's/iPhone Developer/iPhone Distribution/' Yattee.xcodeproj/project.pbxproj
+      - uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: '26.0.1'
+      - name: Install iOS/tvOS platform SDKs if missing
+        run: |
+          sudo xcodebuild -downloadPlatform iOS || true
+          sudo xcodebuild -downloadPlatform tvOS || true
       - name: Clear SPM cache
-        run: rm -rf ~/Library/Caches/org.swift.swiftpm/artifacts
+        run: |
+          rm -rf ~/Library/Caches/org.swift.swiftpm
+          rm -rf ~/Library/org.swift.swiftpm
+          rm -rf ~/Library/Developer/Xcode/DerivedData
       - uses: maierj/fastlane-action@v3.0.0
         with:
           lane: ${{ matrix.lane }}
@@ -63,8 +73,14 @@ jobs:
         run: |
           sed -i '' 's/match AppStore/match Direct/' Yattee.xcodeproj/project.pbxproj
           sed -i '' 's/3rd Party Mac Developer Application/Developer ID Application/' Yattee.xcodeproj/project.pbxproj
+      - uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: '26.0.1'
       - name: Clear SPM cache
-        run: rm -rf ~/Library/Caches/org.swift.swiftpm/artifacts
+        run: |
+          rm -rf ~/Library/Caches/org.swift.swiftpm
+          rm -rf ~/Library/org.swift.swiftpm
+          rm -rf ~/Library/Developer/Xcode/DerivedData
       - uses: maierj/fastlane-action@v3.0.0
         with:
           lane: mac build_and_notarize