Agent Skills: epic-planning

Shape an EPIC from human seeds, then derive its clarity-gated PLAN. Specifications-first, Shape-Up style — the EPIC is the work shape (appetite, problem, solution outline, key decisions, rabbit-holes, no-gos) and IS the OpenSpec proposal; the PLAN is the derived executable breakdown (design + tasks) scored by the clarity gate (≥9/10). Drives seed intake and a myriad of clarifying questions, makes no silent assumptions. Trigger on "write/refine an EPIC", "shape this work", "plan this epic", "derive the plan", "turn these seed notes into an epic". For the living-spec lifecycle (archive, grooming, memory) use spec-stewardship; for the doc-first build loop use external stream-coding.