job_chat: errors can be made if rag results come from multiple adaptors

Basically because the rag searches all api docs, there's scope that results can be returned from commcare even if I'm using OpenMRS

Sometimes we probably want to restrict results to a single adaptor. Other times it's appropriate to search multiple adaptors. So I'm not sure of the fix.

Original report from Joe:

Ah, one large error has just come up because the rag has returned hits from multiple adaptors, and so the assistant is confused about which API is available. So it's included code from the wrong adaptor.

Wisdom from Hanna:

I could add a contextualising sentence for each retrieved chunk e.g. "from <title> docs: " ? Theoretically the user could be asking about other adaptors so we probably don't want to filter by section title for the adaptors?

Start by tracing how job_chat searches API documentation through RAG and how adaptor context is represented in retrieved results. Compare single-adaptor requests with questions that intentionally span multiple adaptors, then establish the expected behavior and a reproducible test for mixed-adaptor results. Done means the assistant consistently uses the appropriate adaptor context.