ci: auto-release zip on tag push

Builds edgespark-codex-plugins.zip from plugins/edgespark/ and
creates a GitHub release whenever a semver tag is pushed. Verifies
the tag matches the version in plugin.json before publishing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: xiangzhang-yw

.github/workflows/release.yml

@@ -0,0 +1,44 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "*.*.*"
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Read version from plugin.json
+        id: version
+        run: |
+          VERSION=$(jq -r '.version' plugins/edgespark/.codex-plugin/plugin.json)
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+
+      - name: Verify tag matches plugin.json version
+        run: |
+          TAG="${GITHUB_REF_NAME}"
+          VERSION="${{ steps.version.outputs.version }}"
+          if [ "$TAG" != "$VERSION" ]; then
+            echo "::error::Tag ($TAG) does not match plugin.json version ($VERSION)"
+            exit 1
+          fi
+
+      - name: Build release zip
+        run: |
+          cd plugins
+          zip -r "$GITHUB_WORKSPACE/edgespark-codex-plugins.zip" edgespark/ -x "*.git*"
+
+      - name: Create GitHub release
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh release create "$GITHUB_REF_NAME" \
+            edgespark-codex-plugins.zip \
+            --title "$GITHUB_REF_NAME" \
+            --generate-notes