Architektur: Craftvia-Domänenmodell, Verträge und Team-Schnitte

- Migration 0002_craftvia_domain: 27 Fachtabellen inkl. RLS (enable_tenant_rls)
- TENANT_MODELS (db.ts, backup/topology.ts) um alle Fachmodelle ergänzt
- moduleGuard liefert DB-autoritative Rechte; ServiceCtx für Domänen-Services
- Verträge: Statusmaschine, Events, Nummernkreise, Sichtbarkeits-Scopes,
  Job-Queues + Worker, KI-Provider-Interfaces, Sync-Envelope
- docs/craftvia/ARCHITEKTUR.md mit Lanes, Ownership und DoD

Gate: tsc, lint, build, 22/22 Tests grün.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/server/events.ts

@@ -0,0 +1,16 @@
+import type { DomainEvent } from "@/lib/events";
+import type { ServiceCtx } from "@/server/services/context";
+
+/**
+ * Emit a domain event AFTER the mutation succeeded. Never throws: a failing notification
+ * must not roll back business data — failures are logged and surfaced via sync/notification
+ * monitoring. Lanes call ONLY this function; the notifications lane owns the handler.
+ */
+export async function emitEvent(ctx: ServiceCtx, event: DomainEvent): Promise<void> {
+  try {
+    const { handleEvent } = await import("@/server/services/notifications/handle-event");
+    await handleEvent(ctx, event);
+  } catch (err) {
+    console.error(`[events] ${event.type} for ${event.entityType}:${event.entityId} failed:`, (err as Error).message);
+  }
+}