ci: add release workflow to publish artifacts on tag push

.github/workflows/pr-title.yml

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+name: PR Title
+
+# Validate that PR titles follow the Conventional Commits specification
+# (e.g. "feat: ...", "fix: ...", "ci: ...").  This is enforced so that
+# release-drafter and changelog tooling can reliably categorise changes.
+
+on:
+  pull_request_target:
+    types: [opened, reopened, edited, synchronize]
+
+permissions:
+  pull-requests: read
+
+jobs:
+  lint:
+    name: Conventional Commit
+    runs-on: ubuntu-latest
+    steps:
+      - uses: amannn/action-semantic-pull-request@v6
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/release.yml

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+name: Release
+
+# Build and attach artifacts when a version tag is pushed, then publish
+# the draft release that release-drafter has already prepared.
+
+on:
+  push:
+    tags: ["v*"]
+
+permissions:
+  contents: write
+
+jobs:
+  # Re-use the CI workflow so we don't duplicate build definitions.
+  ci:
+    uses: ./.github/workflows/ci.yml
+    permissions:
+      contents: read
+
+  release:
+    name: Publish Release
+    runs-on: macos-15
+    needs: [ci]
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      # Build everything from scratch (cleaner than downloading CI artifacts
+      # across jobs, and takes ~30s on macos-15 runners).
+      - name: Build CLI
+        run: make build-cli
+
+      - name: Build Swift app
+        run: make build-swift
+
+      - name: Assemble .app bundle
+        run: make build-app
+
+      - name: Build DMG
+        run: make build-dmg
+
+      # Zip the .app bundle so it survives upload as a single file.
+      - name: Package .app as zip
+        run: cd build && zip -r Graftery.app.zip Graftery.app
+
+      # Upload artifacts to the release. softprops/action-gh-release will
+      # find the existing draft (created by release-drafter) for this tag,
+      # attach the files, and publish it.
+      - name: Upload release assets
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            build/Graftery.dmg
+            build/Graftery.app.zip
+            build/graftery