Add GitHub Actions workflow for HF Spaces deployment

Automatically syncs GitHub repo to Hugging Face Spaces
on push to main branch.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.github/workflows/deploy-hf.yml

@@ -0,0 +1,23 @@
+name: Deploy to Hugging Face Spaces
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          lfs: true
+
+      - name: Push to Hugging Face Spaces
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: |
+          git remote add hf https://user:$HF_TOKEN@huggingface.co/spaces/MCP-1st-Birthday/explainor || true
+          git push hf main --force