The api: "antigravity" field being added to opencode.json causes
authentication failures with the antigravity plugin.
Fixes: NoeFabris/opencode-antigravity-auth#49
- Add user reviews section to READMEs (EN, KO, JA, ZH-CN)
- Update Antigravity request.ts: change default model from gemini-3-pro-preview to gemini-3-pro-high
- Enhance config-manager.ts: add full model specs (name, limit, modalities) to provider config
- Add comprehensive test suite for config-manager (config-manager.test.ts)
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