Reviews a feature implementation or plan against the original ask — flags scope beyond the minimum version, complexity beyond the simplest implementation, and at most three strictly-capped low-hanging-fruit wins, reporting findings without applying changes. Use when a feature implementation or plan exists (working tree, branch diff, or design doc) and it should be checked before commit/PR — after finishing a feature, when a diff feels bigger than the ask, when unsure whether extra fields/endpoints/abstractions belong, or when the user asks "is this the minimal version?" or invokes /scope-check.
