feat(smartfs.directory): Add directory treeHash: deterministic content-based hashing of directory trees with streaming and algorithm option

ts/interfaces/mod.types.ts

@@ -215,3 +215,13 @@ export interface IWatchOptions {
   filter?: string | RegExp | ((path: string) => boolean);
   debounce?: number;
 }
+
+/**
+ * Tree hash options interface
+ */
+export interface ITreeHashOptions {
+  /**
+   * Hash algorithm to use (default: 'sha256')
+   */
+  algorithm?: string;
+}