fix: make RoleClassificationNode.kind required (#1919)

docs check acknowledged — type-tightening only, no behavior change.

Impact: 1 functions changed, 0 affected

Author: carlos-alm

src/graph/classifiers/roles.ts

@@ -156,7 +156,7 @@ export function median(sorted: number[]): number {
 export interface RoleClassificationNode {
   id: string;
   name: string;
-  kind?: string;
+  kind: string;
   file?: string;
   fanIn: number;
   fanOut: number;