fix: stage updater worker head interpolation repair

.github/workflows/patch-updater34-worker-head.yml

@@ -0,0 +1,46 @@
+name: Patch Updater 3.4 Worker Head Interpolation
+
+on:
+  push:
+    branches:
+      - feature/updater-3.4-lifecycle
+
+permissions:
+  contents: write
+
+concurrency:
+  group: patch-updater-34-worker-head
+  cancel-in-progress: false
+
+jobs:
+  patch:
+    if: ${{ github.actor != 'github-actions[bot]' }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          ref: feature/updater-3.4-lifecycle
+          fetch-depth: 0
+
+      - name: Mehrdeutige Head-Interpolation reparieren
+        shell: python
+        run: |
+          from pathlib import Path
+          path = Path('scripts/updater/Vendoo.Updater.Worker34.ps1')
+          text = path.read_text(encoding='utf-8-sig')
+          count = text.count('$head:')
+          if count != 2:
+              raise SystemExit(f'Erwartet wurden exakt 2 $head:-Stellen, gefunden: {count}')
+          text = text.replace('$head:', '${head}:')
+          path.write_text(text, encoding='utf-8-sig', newline='\n')
+
+      - name: Patch committen und temporären Workflow entfernen
+        shell: bash
+        run: |
+          set -euo pipefail
+          rm -f .github/workflows/patch-updater34-worker-head.yml
+          git config user.name 'vendoo-updater-build'
+          git config user.email 'vendoo-updater-build@users.noreply.github.com'
+          git add --all
+          git commit -m 'fix: make updater head interpolation PowerShell-safe'
+          git push origin HEAD:feature/updater-3.4-lifecycle