sequences

Use to add Mermaid sequenceDiagram blocks to the SAD's runtime view (sad.md §6) — one per critical flow, showing how a request moves between participants with happy + error paths. Triggers on "sequences for {slug}", "sequence diagram for {slug}", "draw the runtime flow", "add a sequence to the SAD", "/sdd:sequences {slug}", "діаграми послідовності {slug}", "sequence для {slug}", "намалюй потік {slug}". Reads sad.md §5 for participants, drafts each flow from templates/sequence.md with generic participants, walks them Socratically one flow at a time, and writes confirmed blocks into sad.md §6 — they inform data-model indexes downstream. Hard-refuse if sad.md is missing → run design {slug} first.