ci: add release workflow for tagged releases

.github/workflows/release.yml

@@ -0,0 +1,31 @@
+# Release workflow for trace (Go library — no binaries).
+# Triggered when a v* tag is pushed; publishes a GitHub Release with
+# auto-generated notes. Consumers depend on the tag via
+# `go get github.com/GrayCodeAI/trace@vX.Y.Z`.
+
+name: release
+
+on:
+  push:
+    tags: ["v*"]
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@da05d552573ad5aba039eaac05058a918a7bf631 # v2.2.2
+        with:
+          generate_release_notes: true
+          draft: false
+          prerelease: auto
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}