chore(models): replace gemini-3.5-flash with gemini-3-7-flash

[sanchitmehtagit]

Description

Swaps gemini-3.5-flash for gemini-3-7-flash across the model registry. Gemini 3.7 Flash is Google's latest coding-focused Flash model, scoring 65.3% on DeepSWE v1.1 vs 49.0% for its predecessor. Pricing is also updated to reflect current rates.

Changes:

• packages/evals/src/cli/constants.ts: updated KNOWN_WORKING_MODELS array
• packages/evals-core/src/config/costs.ts: updated COST_TABLE entry from [1.5, 9.0] to [0.75, 3.75] (USD per 1M tokens, input/output)
• packages/evals/README.md: updated model list in docs

References

• https://blog.google/innovation-and-ai/models-and-research/gemini-models/introducing-gemini-3-7-flash/

Testing

Registry-only change - no logic modified. Existing tests pass unchanged.

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch

[coderabbitai]

Important

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Run ID: 0615530d-9fc0-479c-b144-3c3192ac7f4e

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