When model != DEFAULT_EMBEDDING_MODEL, generate_embedding now
calls client.embed(text, model=model) and wraps the returned
vector in an EmbeddingResult tagged with the requested model.
On any exception (NotImplementedError from providers without an
embeddings endpoint, transient network errors, etc.), the existing
T107 warning fires and the function falls back to the zero-vector
sentinel — callers detect model == 'fallback' and skip indexing.
Adds:
- MockLLMClient accepts a canned_embeddings queue mirroring
the existing canned pattern. embed() pops from the front;
empty queue raises IndexError so misconfigured tests fail
loudly.
- Settings.embedding_model defaults to "pseudo-sha256-384"
so existing zero-config installs keep Phase 4 behavior. The app
lifespan now passes this through to EmbeddingWorker.model.
The public signature of generate_embedding is unchanged:
(client, *, text, model=DEFAULT_EMBEDDING_MODEL, dim=..., timeout_s=...).
Joseph Doherty