Surface technical, compliance, integration and operational constraints (TC/CC/IC/OC-XXX) from the PRD or one specification, each with rationale, affected requirement IDs, interactions and risk flags. Use before technical design or ticket breakdown when the system has regulatory, infrastructure or integration boundaries, such as 'what compliance rules apply to this' or 'what limits does the legacy system put on us'. Not for choosing an architecture (technical-design) or ordering work across areas (dependencies).
