Turn a feature request into implementation-ready spec files for a coding agent. Use whenever the user wants to plan, scope, or write a spec for a feature about to be built — "write a spec for X", "plan feature Y", "how should we build Z", "draft an implementation plan". Produces a parent epic plus one file per independently-buildable slice. Prefer over write-spec when the audience is a coding agent, not an exec. Auto-applies the KeeForge overlay when the repo looks like KeeForge.