chore(ci): add npm deprecation workflow

Author: benvinegar

.github/workflows/deprecate-npm-version.yml

@@ -0,0 +1,38 @@
+name: Deprecate npm package versions
+
+on:
+  push:
+    branches:
+      - chore/deprecate-0.9.4-npm
+
+jobs:
+  deprecate:
+    name: Deprecate ${{ matrix.package_name }}@0.9.4
+    runs-on: ubuntu-latest
+    environment: npm
+    strategy:
+      fail-fast: false
+      matrix:
+        package_name:
+          - hunkdiff
+          - hunkdiff-linux-arm64
+          - hunkdiff-linux-x64
+          - hunkdiff-darwin-arm64
+          - hunkdiff-darwin-x64
+    steps:
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          registry-url: https://registry.npmjs.org
+
+      - name: Verify npm auth
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: npm whoami
+
+      - name: Deprecate package version
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+          DEPRECATION_MESSAGE: 0.9.4 was published from the wrong branch; please use 0.9.5 or later.
+        run: npm deprecate "${{ matrix.package_name }}@0.9.4" "$DEPRECATION_MESSAGE"