Pre-Implement Spec

Catch the problems in a specification before any code is written. The skill reads one spec, checks it against the repository's own rules — its protected contract surfaces (BACKWARD_COMPATIBILITY.md), its spec template, its agent instructions and review checklist — verifies the spec's claims against the real codebase, and leaves a structured report with a mechanical go / conditional / no-go verdict, every finding classified and paired with a concrete fix.

It is interactive (acts once, may ask the user to pick between ambiguous spec candidates, reports, and hands back) and analysis-only: the only file it writes is the report. Spec changes are proposed in the report for the author, never applied.

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