- Create server/src/routes/skill-registry-groups.ts with skillGroupRoutes() factory
- All 14 REST routes for group CRUD, members, export/import, and agent assignments
- Import route registered before :groupId param to avoid route collision
- assertBoard on every handler, error classification (400/404/409/500)
- Mount skillGroupRoutes() in app.ts after skillRegistryRoutes()
- Add pendingSkillGroups fire-and-forget reconciliation in index.ts startup
