The provider prefix is not cosmetic: the openai/ prefix makes LiteLLM apply
OpenAI parameter validation to any model behind it, and slopo always passes
dimensions, so a local OpenAI-compatible server needs its own prefix.
Five settings are frozen into the database at first index, so changing the
embedding model means re-embedding everything. And a review cannot bootstrap the
database at all, because agent-review opens the index read-only.
