debug: add comprehensive logging to trace VFS undefined names bug

- Add debug logging to VFS readdir() to show children and VFSDirent structure
- Add debug logging to PathResolver.getChildren() to trace entity retrieval
- Add debug logging to convertNounToEntity() to trace metadata extraction
- Helps diagnose v4.8.4 VFS undefined names bug reported by Workshop team

Ref: BRAINY_V4.8.4_VFS_UNDEFINED_NAMES_BUG.md

src/brainy.ts

@@ -573,6 +573,14 @@ export class Brainy<T = any> implements BrainyInterface<T> {
     // v4.8.0: Storage adapters ALREADY extract standard fields to top-level!
     // Just read from top-level fields of HNSWNounWithMetadata
 
+    console.log(`[DEBUG convertNounToEntity] Converting noun ${noun.id}:`, {
+      nounMetadataKeys: noun.metadata ? Object.keys(noun.metadata) : [],
+      nounType: noun.type,
+      hasName: !!noun.metadata?.name,
+      hasPath: !!noun.metadata?.path,
+      hasVfsType: !!noun.metadata?.vfsType
+    })
+
     // v4.8.0: Clean structure with standard fields at top-level
     const entity: Entity<T> = {
       id: noun.id,
@@ -592,6 +600,13 @@ export class Brainy<T = any> implements BrainyInterface<T> {
       metadata: noun.metadata as T
     }
 
+    console.log(`[DEBUG convertNounToEntity] Converted entity metadata:`, {
+      entityMetadataKeys: entity.metadata ? Object.keys(entity.metadata as any) : [],
+      metadata_name: (entity.metadata as any)?.name,
+      metadata_path: (entity.metadata as any)?.path,
+      metadata_vfsType: (entity.metadata as any)?.vfsType
+    })
+
     return entity
   }