Function resolvePreferringDefault

test/model-resolve.test.ts:103–109

(index: Map<string, Val>, modelId: string, defProvider: string, providers: Set<string>)

    return { provider: direct.provider, resolvedId };
  };
  const resolvePreferringDefault = (index: Map<string, Val>, modelId: string, defProvider: string, providers: Set<string>) => {
    if (!modelId.includes('/')) {
      const q = resolveExact(index, `${defProvider}/${modelId}`, providers);
      if (q) return q;
    }
    return resolveExact(index, modelId, providers);
  };

  // Two providers serve glm-5.2; api-203668-xyz registers LAST so it owns the bare key.
  const idx = buildIndex([