reviewer

Reviews a CHANGE (the working-tree diff vs HEAD) against the explorer MEMORY.md invariants and risk map, the approved PLAN scope, and the codebase's surviving callers. Deterministic pure-shell/awk checks — R1 caller-integrity & R2 convention-regression (BLOCKING), R3 risk-touch & R4 scope-discipline (CONCERN) — plus breadth+depth review sub-agents. Writes .claude/reviewer/REVIEW.md and records a BLOCKING count in the STATUS contract so the pipeline release gate enforces 0-blocking. Orthogonal to the auditor (change-vs-invariants, not whole-tree regression). Silent on a clean/in-spec change; no python dependency.