Enriches each user story's acceptance criteria with a "Relevant constraints" line pointing to the specific architecture decisions, implementation heuristics, design principles, and UI kit that apply to that story. Use this skill after any phase that introduces new constraints — after architecture decisions are written (Phase 3), after the UI kit is approved (Phase 4), and after implementation heuristics and design principles are established (Phase 5). Also invoke whenever a Phase 6 agent reads the acceptance criteria and lacks a clear picture of which constraints govern a particular story. Safe to re-run at any phase — each invocation only adds constraints not already listed; nothing is ever removed from an existing entry.