ci: add GitHub Actions workflow to sync main to HF Space

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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

@@ -0,0 +1,21 @@
+name: Sync to Hugging Face Space
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  sync-to-hf:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          lfs: true
+
+      - name: Push to Hugging Face Space
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: |
+          git push https://CallMeDaniel:$HF_TOKEN@huggingface.co/spaces/CallMeDaniel/neuralcad main