Portfolio agent: from question to cited answer Diagram

Refusal: off-topic or private question (scope check)
Not enough verified information: graph_unavailable, graph_no_evidence, no_supported_claims, model_output_invalid, claims_rejected, source_conflict
Infrastructure reasons (graph_unavailable, model_not_configured, model_output_invalid, unexpected_error) email Owen through Resend, at most once per reason per hour
Tavily web search adds context from trusted domains; it never replaces a graph fact