Use dynamic version

.github/workflows/release.yml

@@ -1,34 +1,29 @@
 name: Manual Release
-
 on:
   workflow_dispatch:
-    inputs:
-      version:
-        description: "Release version (must match package.json)"
-        required: true
-      prerelease:
-        description: "Mark as prerelease"
-        type: boolean
-        default: false
-
+permissions:
+  contents: write
 jobs:
   release:
     runs-on: ubuntu-latest
-
     steps:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-
       - name: Set up Node
         uses: actions/setup-node@v4
         with:
           node-version: 20
           cache: npm
-
       - name: Install deps
         run: npm ci
-
+      - name: Ensure version is not already tagged
+        run: |
+          VERSION=$(node -p "require('./package.json').version")
+          if git rev-parse "v$VERSION" >/dev/null 2>&1; then
+            echo "Tag v$VERSION already exists. Bump version first."
+            exit 1
+          fi
       - name: Build + publish
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}