Add GitHub Actions workflow to auto-sync to HF Spaces

Pushes to main automatically deploy to huggingface.co/spaces/Wil2200/prefero
using the HF_TOKEN repo secret.

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

.github/workflows/sync-to-hf.yml

@@ -0,0 +1,20 @@
+name: Sync to Hugging Face Spaces
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          lfs: true
+
+      - name: Push to Hugging Face
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: |
+          git push https://Wil2200:$HF_TOKEN@huggingface.co/spaces/Wil2200/prefero main --force