Get Setup Conversation

Return the raw onboarding conversation that created this template.

Lossless retrieval: transcript(s), chat messages (embedded in transcript), frame captures, and attachments. No summarization. Enables the MCP (and any downstream tooling) to see exactly what the user said during setup — which mechanical checks on the configured template can never reconstruct.

The linkage uses the reverse pointer already written during setup-assistant processing: interviews.context.created_template_id.

Returns 200 with status='no_seed_interview' when the template was created outside the setup-assistant flow (imported, manually created, etc.). That is a normal state, not an error.