Use when constitution, spec, plan and tasks all exist and you want them cross-read against each other before any code is written — the rsc-sdd pre-implementation gate. Reports coverage gaps, contradictions, duplication, ambiguity and scope drift; edits nothing. NOT the task breakdown (that is `tasks`), NOT the coding (that is `implement`), NOT the post-code test gate (that is `verify`), NOT resolving ambiguity (that is `clarify`).
