feat(ai-gateway): expose Terminal Bench model stats

[lambertjosh]

Summary

• Enrich the existing OpenRouter model catalog with optional Terminal Bench 2.0 completion and per-attempt cost metadata.
• Publish active non-internal results with at least five attempts and a complete-attempt cost; stealth models remain eligible.
• Cache the compact benchmark map for five minutes and fail open to stale or empty data so stats lookup failures never block model selection.

Verification

• Manually verified end to end (see feat: show Terminal Bench model details kilocode#10879)

Visual Changes

N/A

Reviewer Notes

• Prefer deploying this catalog enrichment before the client PR, although either order is safe because the new field is optional.
• Metrics attach only to canonical OpenRouter catalog entries, with the existing safe outer kilo/ prefix fallback.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

The new fix commit correctly resolves the previously flagged concern — internal (kilo-internal/*) benchmark summaries are now excluded at both the DB query layer (notLike) and the in-memory filter (startsWith(CUSTOM_LLM_PREFIX)), while stealth models are correctly made eligible as intended.

Files Reviewed (5 files)

• apps/web/src/lib/model-stats/terminal-bench.ts
• apps/web/src/lib/model-stats/terminal-bench.test.ts
• apps/web/src/lib/ai-gateway/providers/openrouter/index.ts
• apps/web/src/lib/organizations/organization-types.ts
• apps/web/src/tests/openrouter-models.test.ts

Changes since last review (commit 3a2bd50)

fix(ai-gateway): exclude internal benchmark summaries

• Removes isStealth from the DB query and eligibility filter; replaces it with a CUSTOM_LLM_PREFIX (kilo-internal/) prefix check at both the SQL level (notLike) and in-memory (startsWith).
• Stealth models are now correctly eligible for Terminal Bench stats.
• Tests updated to verify kilo-internal/* models are excluded and stealth models are included.
• All previous review notes remain non-blocking; no new issues introduced.

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_{Reviewed by claude-4.6-sonnet-20260217 · 597,038 tokens}

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