Add push-staging.sh: push + patch staging Space metadata

Keeps README.md prod-canonical in git. After each push to origin,
calls huggingface_hub.metadata_update() to set staging title/color
independently — no more merge conflicts on prod promotion.

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

scripts/push-staging.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# Push main to staging HF Space and patch its title/color.
+# README.md stays prod-canonical in git; staging display name set independently.
+set -euo pipefail
+
+STAGING_REMOTE="origin"
+STAGING_SPACE="ServiceNow-AI/NowAI-Bench-Staging"
+STAGING_TITLE="NowAI-Bench Staging"
+STAGING_COLOR="indigo"
+
+echo "→ Pushing to staging..."
+git push "$STAGING_REMOTE" main
+
+echo "→ Patching staging Space metadata..."
+python3 - <<PYEOF
+from huggingface_hub import metadata_update
+url = metadata_update(
+    "$STAGING_SPACE",
+    {"title": "$STAGING_TITLE", "colorFrom": "$STAGING_COLOR"},
+    repo_type="space",
+    overwrite=True,
+)
+print(f"  committed: {url}")
+PYEOF
+
+echo "✓ Staging Space ready: https://huggingface.co/spaces/${STAGING_SPACE}"