Summary

Extends WorkerMetadata with model configuration fields to enable per-model routing and provider selection.

Changes

New fields:

• models: Vec - models this worker can serve
• default_provider: Option - fallback provider
• default_model_type: ModelType - fallback capabilities

New WorkerMetadata methods:

• find_model() - lookup by ID or alias
• supports_model() - check if worker serves a model
• supports_endpoint() - check endpoint support per model
• provider_for_model() - get provider for a model
• model_ids() - iterate over model IDs

Checklist

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