feat(housekeeping): validate preview route runtime

src/features/housekeeping/foundation/registry.ts

@@ -80,6 +80,20 @@ export function createHousekeepingRegistry(
 			validateNonEmpty(route.labelKey, "route label key");
 			validateCapability(route.capability);
 		}
+
+		if (manifest.routes.length === 0) {
+			if (manifest.landingRouteId !== null) {
+				throw new Error(
+					`landing route without routes: ${manifest.landingRouteId}`,
+				);
+			}
+		} else if (manifest.landingRouteId === null) {
+			throw new Error(`missing landing route: ${manifest.id}`);
+		} else if (
+			!manifest.routes.some((route) => route.id === manifest.landingRouteId)
+		) {
+			throw new Error(`invalid landing route: ${manifest.landingRouteId}`);
+		}
 	}
 
 	return { domains: Object.freeze([...manifests]) };