Adds .github/workflows/release.yml — on push to main, if the plugin.json version changed and no v<version> tag exists, it creates the tag + a GitHub Release with notes pulled from the matching VERSIONS.md block. Idempotent (skips if already tagged). Closes the manual-release gap that left v2.10.1–v2.11.0 untagged. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>