Problem Definition
Covers Stage 2, PROBLEM_DISCOVERY (docs/PROCESS_CONTRACT.md §5). An AI
execution provider may draft or research the problem context under human
direction, but the Product Owner alone approves the statement as accurate
and complete — an AI-produced draft is not evidence that the problem is
correctly understood.
Rejection path
Wrong or unclear scope → the Work Packet returns to
request-intake/triage at REQUIREMENT_INTAKE
(docs/PROCESS_CONTRACT.md, stage PROBLEM_DISCOVERY, "Rejection path").