Defines a per-model capability matrix for all 10 target models across
anthropic, openai, zai, and ollama providers. Adds the ModelCapability
interface to @mosaic/types and exports lookup helpers (getModelCapability,
findModelsByCapability, getModelsByProvider, getAllModels) from the
gateway agent module to support capability-aware routing.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>