synthesize Gemini sampling defaults only for the older model families that still advertise support: 2.5, 3 Flash/Pro, 3.1, and 3.5 Flash
classify compatibility using model.api.id, the model ID actually sent to the provider
omit synthesized temperature, top_p, and top_k defaults for Gemini 3.5 Flash-Lite, Gemini 3.6+, unknown models, and future generations
Google documents all three fields as deprecated and ignored for Gemini 3.6 Flash and Gemini 3.5 Flash-Lite, with the same API contract applying to future model releases: https://ai.google.dev/gemini-api/docs/latest-model
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Summary
Google documents all three fields as deprecated and ignored for Gemini 3.6 Flash and Gemini 3.5 Flash-Lite, with the same API contract applying to future model releases: https://ai.google.dev/gemini-api/docs/latest-model
Fixes #38767
Testing
Requested by: @rekram1-node (Aiden Cline via Slack)