- Added comprehensive `models.yml` provider integration guide documenting custom model registration, provider overrides, API adapters, merge behavior, and practical integration patterns for Ollama, vLLM, LM Studio, and proxy endpoints.
- Updated README to reference new `models.yml` documentation and clarified that `models.json` is still supported for legacy configurations.
- Updated CHANGELOG to document the new models.yml guide and configuration format migration.
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