plan-feature-scaffold

# Plan Feature — Scaffold (internal) Turn a designed feature into the project's complete planning artifact set, ready for phase-by-phase execution. Fills only the SPEC's **engineering half** — the product half (goal, context, scope, capability closure) already exists and is marked `designed` before this skill ever runs (`plan-feature`'s redirect gate guarantees it). **Docs only — never code.** ## When to use - The `plan-feature` router calls this once a feature's product half is `designed` — from `design-feature`, `plan-feature-from-issue`, or an already-scoped slug/SPEC — to fill the engineering half of its `docs/features/<NN>-<slug>/SPEC.md` and the rest of the folder, then update the roadmap. Not for product definition (that is `design-feature`) or writing code (that is `execute-phase`) or deciding *whether* to build (that is the `plan-feature` router / `triage-issue`). ## Step 0 — Discover the project (always first) Per the agent guide's **Workflow conventions** + **documentation map**, then read what THIS skill needs: the feature SPEC **template**, the **roadmap** (numbering/order/deps), 1–2 recent feature folders to mirror the artifact set, and the architecture/domain docs the map points to. No template/roadmap → fall back to the agent guide and state the assumption. ## Process 1. **Verify the product half is designed.** The SPEC's `## Design status` must read `designed` and Capability closure must be filled — `plan-feature`'s redirect gate already...