Gate alpha8 release on full Ruby matrix

.github/workflows/release.yml

@@ -6,7 +6,34 @@ on:
       - "v*"
 
 jobs:
+  verify:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: ["3.2", "3.3", "3.4", "4.0"]
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+
+      - name: Set up Ruby ${{ matrix.ruby }}
+        uses: ruby/setup-ruby@003a5c4d8d6321bd302e38f6f0ec593f77f06600 # v1.319.0
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+
+      - name: Run tests
+        run: bundle exec rake test
+
+      - name: Build gem
+        run: gem build opencode-ruby.gemspec
+
+      - name: Verify gem loads after install
+        run: |
+          gem install opencode-ruby-*.gem --no-document
+          ruby -ropencode-ruby -e 'puts Opencode::VERSION'
+
   push:
+    needs: verify
     if: ${{ github.server_url == 'https://github.com' }}
     runs-on: ubuntu-latest
     permissions: