Assistant: 'Deep research' option errors for the user

[jaysanderson]

What

A user reported an error when using the Deep research toggle in the Assistant ("this happened when I tried the deep research option"). The exact error text/screen was not captured in a form the session could open.

Status

• Not reproduced yet - the screenshot never reached a session that could view it.
• Code inspection: the deep-research path fails safe at the sub-question decomposition step, so the error most likely comes from the deep ask's rag-strategy call (full-document grounding). Not confirmed.

Needs

• Repro steps or the exact error text/console output (tenant, question, screenshot).
• Then trace the deep-ask rag-strategy path.

Where

apps/web/src/pages/AssistantPage.tsx (Deep research toggle) + the deep-ask path in the API answer route / retrieval provider.