What problem does it solve? Code reviews often lose traceability between requirements, design decisions, and implementation, and unsupported conclusions slip through when evidence is scattered. This Skill enforces evidence-based QA review that keeps Why/What/Where/How trace links connected and produces a defensible pre-CI gate verdict. ## Core Features & Use Cases - XDDP Trace-Continuity Review: Verifies every implementation target traces back to a requirement difference, TM row, or approved scope decision. - Four-Domain Review: Executes specification, performance, security, and license reviews with recorded per-domain results and findings. - System-Impact Analysis: Classifies graph-backed impact candidates as included, excluded, unknown, or handed off, including DB manufacturing artifacts like DDL, migrations, and stored procedures. - Gate Verdict Output: Emits a blocked, needs-review, or proceed verdict with evidence and downgrade reasons. - Use Case: Before merging a diff that touches C# code and database migrations, run this Skill to confirm trace continuity, review security and license compliance, and receive a routing verdict for CI. ## Quick Start Ask the AI to run a QA gate review on the current diff against the design evidence and coding rules, and produce the gate verdict.