feat(models): add canonical Drex 2.0 decision model

[itomatik]

Drex 2.0 currently exists only as an auto-synced OpenRouter entry, which labels it closed-weight, disables structured output and advertises 117,964 generated output tokens. Add canonical Nace AI metadata and make OpenRouter inherit it: open weights, typed decisions, 131,072-token maximum context and no generated output tokens. Provider pricing remains $0.06/M input and $0/M output.

OpenRouter's feed supplies a positive max_completion_tokens even for output_modalities = ["decisions"]. Normalize decision-model output limits to zero during sync so the incorrect limit is not restored. Chat-model output-limit handling is unchanged. Extend the existing decision tests and cover Drex 2.0 inheritance with both new and stale provider metadata.

Sources:

• Public Hugging Face model card and weights: 35B total / approximately 3B active parameters, no generation, Nace.AI Open RAIL-M license. Unauthenticated metadata reports private: false, gated: false, created October 6 and last modified October 12.
• Published context limits: 16,384 default, configurable to 131,072. This is the model maximum; the first-party API's smaller serving limit and fallback are not model limits.
• Nace model documentation: October 6 release date. October 12 in OpenRouter is its listing date.
• OpenRouter listing and decision-model feed: provider pricing and context.

Validation:

• bun validate passes.
• OpenRouter/Drex focused sync tests: 19 passed.
• SDK generation, typecheck and tests: 25 passed.
• Generated catalog resolves the intended capabilities and limits; translating the live OpenRouter Drex 2.0 feed produces exactly the authored provider entry.
• Full sync suite: 210 passed, 6 failed. The same six failures reproduce on untouched upstream 85382da (209 passed): Hyper reasoning, Eden AI reasoning, DeepInfra modalities, LLM Gateway case variants, and two Vercel description assertions.

[github-actions]

No actionable findings.

[itomatik]

@rekram1-node Thanks for merging our Drex 1.5 listing in #8896! Could you review this follow-up adding Drex 2.0? It adds canonical model metadata and fixes OpenRouter’s sync to preserve zero generated-output tokens for decision models. All checks pass.