Add GitHub Actions release workflow

Automatically publishes an AOT linux-x64 binary and creates a GitHub
release with auto-incrementing semantic versioning on each push to the
release branch.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ChaseDRedmon

.github/workflows/release.yml

@@ -0,0 +1,49 @@
+name: Release
+
+on:
+  push:
+    branches: [release]
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Determine next version
+        id: version
+        run: |
+          latest=$(git tag --sort=-v:refname | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' | head -n 1)
+          if [ -z "$latest" ]; then
+            next="v1.0.0"
+          else
+            IFS='.' read -r major minor patch <<< "${latest#v}"
+            patch=$((patch + 1))
+            next="v${major}.${minor}.${patch}"
+          fi
+          echo "tag=$next" >> "$GITHUB_OUTPUT"
+          echo "Next version: $next"
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+          dotnet-quality: 'preview'
+
+      - name: Publish linux-x64 AOT binary
+        run: dotnet publish src/Scufpad/scufpad.csproj -c Release -r linux-x64 -o publish/
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ steps.version.outputs.tag }}
+          name: Scufpad ${{ steps.version.outputs.tag }}
+          generate_release_notes: true
+          files: publish/scufpad