scaffold-design-speclisted

## Inputs - `docs/design/catalog.md` (doc type reference) - `docs/design/catalog-config.json` (enabled spec IDs) - `sprint.json` → id - `backlog.json` → PBI IDs for related_pbis ## Outputs - `docs/design/specs/{category}/{id}-{slug}.md` stub files - YAML frontmatter: catalog_id, created_sprint, last_updated_sprint, related_pbis, frozen: false, revision_history ## Preconditions - state.json phase: "sprint_planning" - catalog.md, catalog-config.json, sprint.json, backlog.json exist ## Steps 1. Read catalog-config.json→enabled IDs. Cross-reference catalog.md→get category/name/granularity 2. Each enabled entry without existing file: a. Create `docs/design/specs/{category}/{id}-{slug}.md` (auto-create dirs) b. YAML frontmatter: catalog_id, created_sprint, last_updated_sprint (same), related_pbis, frozen: false, revision_history (initial entry: sprint, author: "scrum-master", date, summary: "Initial stub created", pbis) c. Placeholder sections: Overview, Design Details, Constraints, References d. Category `docs/`→doc placeholders: Overview, Usage, API Reference, Examples e. Category `technology/`→library-spec placeholders: Library & Version, Verified API Surface, Gotchas, Sources (source URL per claim) f. **No History / Changelog placeholder** in any template — the body states the present state only (`docs/design/catalog.md` Governance Rule 8); the trail lives in the frontmatter `revision_history` seeded in step 2b. 3. Skip existing