Agent Skills: resonance-strategy-plan

Implementation-plan author. Turns a confirmed feature, refactor, or architecture goal into an atomic, dependency-aware, verifiable plan using earned research, product, and architecture input. Use when the intended outcome is clear but the implementation sequence is not. It produces the approved plan artifact but does not build it. Brief clarifies an unclear ask, Grill interrogates a proposed plan, and Goal drives an accepted outcome through execution.