defaultEmbeddingModelNamesRole

Whether defaultEmbeddingModel names a role from embeddingServices or embeddingRoles rather than a model.

The embedding counterpart of defaultLlmNamesRole, and what lets the embedding default resolve per call: a name that matches a registered service is resolved once at startup, and a role goes through the resolver chain on every call, so a key arriving after boot satisfies the default without a restart.

Configuration alone decides this: a name that appears as a role key is a role. It cannot collide with a model name, because a role and the model it names are the two sides of one entry and nothing would map a role to itself.