feat(models): support Grok 4.5/4.6 on xAI and OpenRouter - #2871

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: release-drafter/release-drafter@67e173cadb2fbd3de94f4a861e0c48c913b462ae. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

"pull_request_target.edited" is not a known webhook name (https://developer.github.com/v3/activity/events/types/)

"pull_request_target.synchronize" is not a known webhook name (https://developer.github.com/v3/activity/events/types/)

"pull_request_target.reopened" is not a known webhook name (https://developer.github.com/v3/activity/events/types/)