* feat(antigravity): update default model to Claude Opus 4.6
Claude Opus 4.5 has been replaced by Claude Opus 4.6 on the
Antigravity (Google Cloud Code Assist) platform.
- Update DEFAULT_MODEL in google-antigravity-auth extension
- Update testing docs to reference the new model
* fix: update remaining antigravity opus 4.5 refs in zh-CN docs and tests
Address review comments from Greptile:
- Update zh-CN/testing.md antigravity model references
- Update pi-tools-agent-config.test.ts model IDs
* Antigravity: default OAuth model to Opus 4.6 (#10720) (thanks @calvin-hpnet)
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Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>
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