Expand Spec Architecture

Expand a rough markdown spec into a high-level architecture & design spec written for humans — decision-focused prose plus diagrams (SVG), closing with a build plan / task DAG so the execution shape can be reviewed before implementation — for design review and cross-team alignment. Use when the user wants the big-picture architecture, the key decisions, and what each team must do, NOT an implementation-ready spec. Contrast with /expand-spec-technical: that skill produces a detailed technical spec (concrete types, file-level integration points) consumable by both human implementers and coding agents. This skill stays at the architecture level and is written predominantly …