Feat/antigravity models#34
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- Map 4 public model IDs to upstream IDs (gemini-3.5-flash-*, gemini-3-pro-preview) - Add fallback chains for gemini-3.1-pro-high/low on upstream 400 errors - Apply alias resolution in wrapRequest via overrideModel param - Retry Chat/Stream with next fallback candidate on ErrUpstream - Add 13 antigravity models to provider catalog
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What
Add Antigravity provider support with model alias mapping, upstream fallback chains, and full model catalog.
Why
Antigravity Cloud Code API uses different upstream model IDs than the public-facing names. Models like
gemini-3.5-flash-highresolve togemini-3-flash-agentupstream. Additionally, some Pro-family models silently rename their upstream IDs (causing 400 errors), requiring ordered fallback retry chains.
How
gemini-3.5-flash-*,gemini-3-pro-preview) applied at request wrap timegemini-3.1-pro-highandgemini-3.1-pro-lowhave ordered candidate lists;Chat/Streamretry with next candidate onErrUpstreamwrapRequest: newoverrideModelparam for fallback candidates, resolved through alias map before envelope constructionproviderModelsDesign decisions:
ErrUpstream, not client errorsChecklist
go build ./internal/connectors/passesgo test ./internal/connectors/passes (8 tests)make testpassesmake vetpasses