Agent Skills: effect-deep-audit

Deep audit of an Effect-TS codebase against actual Effect core team patterns. Produces a tiered finding list + executable DAG plan, then systematically rewrites non-idiomatic code. USE THIS SKILL WHEN: 'audit this effect code', 'is this idiomatic effect', 'deep audit', starting a new Effect project and want to verify patterns, refactoring an Effect codebase toward library-grade quality, reviewing code before it ships to production. NOT FOR: Greenfield Effect projects (use effect-best-practices skill).