Add a new 'Notification Delivery: Webhooks vs Polling' section to
OPENCLAW_TRICKS.md explaining the two approaches for receiving Gitea
notifications:
1. Direct webhooks for VPS/public server deployments (realtime, push-based)
2. Notification poller for local machines behind NAT (simple, no firewall config)
Includes a comparison table to help users choose.
Update SETUP_CHECKLIST.md Phase 10 to present both options (A and B) with
separate sub-checklists, replacing the previous poller-only instructions.
