feat(ai-gateway): add Laguna S to auto free

[chrarnoldus]

Summary

• add poolside/laguna-s-2.1:free to the auto-free model pool
• retain live OpenRouter catalog gating for candidate availability

Testing

• pnpm exec oxfmt --check apps/web/src/lib/ai-gateway/models.ts
• pnpm --filter web test -- --runInBand src/lib/ai-gateway/models.test.ts
• git diff --check

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Single-line addition of poolside/laguna-s-2.1:free to autoFreeModels; verified against the free-model predicate, AI SDK provider grouping, Vercel mapping, and the OpenRouter catalog gating in getAutoFreeCandidates, with high confidence.

Notes

• isFreeModel returns true via the :free suffix, so models.test.ts "all autoFreeModels should pass isFreeModel" holds without extra registration (unlike the earlier Ling addition, which needed an is-free-model.ts change).
• getAiSdkProvider('poolside/laguna-s-2.1:free', null) returns undefined, matching the other entries, so the "same AI SDK provider" test still passes.
• Availability stays gated: getAutoFreeCandidates only adds non-Kilo-exclusive entries present in the Redis OpenRouter catalog (resolution.ts:90), so an absent model is skipped rather than routed.
• The exact model ID already appears in mapModelIdToVercel.test.ts on main, and poolside is a valid OpenRouter inference provider; it is intentionally left unmapped for Vercel, consistent with the existing OpenRouter-only test.

Files Reviewed (1 file)

• apps/web/src/lib/ai-gateway/models.ts

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_{Reviewed by claude-opus-5 · Input: 42 · Output: 6.6K · Cached: 992.1K}

_{Review guidance: REVIEW.md from base branch main}