mb-from-prd — PRD → Memory Bank (greenfield)

What it does: converts a PRD into structured project knowledge and traceable planning artifacts.
Use it when: the project is greenfield and prd.md or equivalent requirements already exist.
Input: prd.md or user-provided PRD text plus an initialized .memory-bank/.
Output: product, RTM, epics, features, and SDD design routing ready for mandatory /spec-design and per-feature /spec-improve before /prd-to-tasks.

Preconditions

You are in the repo root.
.memory-bank/prd.md exists with type: prd, clarification_status: complete, and constitution_checked: true; otherwise run /write-prd first.
.memory-bank/spec-index.md exists after /spec-init as the required lightweight SDD route map for PRD decomposition. After /prd, mandatory /spec-design consumes that map, records a minimal or full backbone gate, and may update backbone SDD specs and spec-index when features share domain/model/contracts/state/security/runtime design.
Optional Analysis artifacts such as a product brief may exist; use them as upstream PRD input, but do not require them.
.memory-bank/ exists. If not, run mb-init first (or create the skeleton manually).