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/vfs/VirtualFileSystem.ts

@@ -846,6 +846,20 @@ export class VirtualFileSystem implements IVirtualFileSystem {
 
     // Get children
     let children = await this.pathResolver.getChildren(entityId)
+    console.log(`[DEBUG VFS] readdir(${path}): Found ${children.length} children`)
+
+    // Debug first child
+    if (children.length > 0) {
+      const firstChild = children[0]
+      console.log(`[DEBUG VFS] First child structure:`, {
+        id: firstChild.id,
+        type: firstChild.type,
+        metadataKeys: Object.keys(firstChild.metadata || {}),
+        metadata_name: firstChild.metadata?.name,
+        metadata_path: firstChild.metadata?.path,
+        metadata_vfsType: firstChild.metadata?.vfsType
+      })
+    }
 
     // Apply filters
     if (options?.filter) {
@@ -870,12 +884,17 @@ export class VirtualFileSystem implements IVirtualFileSystem {
 
     // Return appropriate format
     if (options?.withFileTypes) {
-      return children.map(child => ({
+      const result = children.map(child => ({
         name: child.metadata.name,
         path: child.metadata.path,
         type: child.metadata.vfsType,
         entityId: child.id
       } as VFSDirent))
+      console.log(`[DEBUG VFS] Returning ${result.length} VFSDirent items`)
+      if (result.length > 0) {
+        console.log(`[DEBUG VFS] First VFSDirent:`, result[0])
+      }
+      return result
     }
 
     return children.map(child => child.metadata.name)