fix: remove unused Dimensions field from OllamaProviderSettings and duplicate test
Code review findings:
- OllamaProviderSettings.Dimensions was never populated or read; daemon
reads cfg.Embedding.Ollama.Dimensions directly from config struct - TestResolveDimensions_UnknownModel_ZeroDimensions_ReturnsError was
identical to TestResolveDimensions_UnknownModel_NoDimensions_ReturnsError
Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com