The L1 Reviewer is the quality gate for all product specs at Headout before they reach Atish. Use this skill to review any PRD, spec, or requirements document for completeness, logical soundness, scenario coverage, metric clarity, and design coherence. Structured critique, not a polish pass. Rejects incomplete specs with specific, actionable failure reasons. A passing spec is ready for Atish. A failing spec returns to the PM with exactly what needs fixing. Trigger for: "review this PRD", "is this spec good enough", "L1 check", "review before I send to Atish", or whenever the Spec Writer finishes a draft. Checks both the LOGIC layer (scenario coverage, metric rigor, AC quality) and the DESIGN layer (design coherence, prototype alignment).