Validate game templates / validate (push) Successful in 9m31s
Adds `gbrgames export`, which builds the games_published payload from every game.yaml, and a CI step that posts it to the panel webhook after validation on main. Unlike the node-agent notify, a failed publish fails the run so stale templates in the panel never go unnoticed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>