Use when the user wants a focused architecture/design review of a codebase — 'review the architecture', 'assess the system design', 'is this well structured?', 'evaluate modularity/coupling/layering', 'map the request lifecycle and dependencies', 'will this scale architecturally?'. Produces a single evidence-backed report (architecture-review.md) with a structure map, request/auth flow, dependency analysis, risks, and improvement proposals. For a full multi-dimension audit use zeroday-auditor instead. Analysis only; never modifies source.
