refactor: update file-graph package structure and integrate with game session management

packages/file-graph/src/index.ts

@@ -1,3 +1,10 @@
 export { default as File, FileObject } from './file.js'
 export { default as FileNode } from './fileNode.js'
 export { default as FileGraph, Event } from './fileGraph.js'
+
+export interface INode {
+  path: string
+  type: string
+  discovered: boolean
+  children?: INode[]
+}