fix: per-sheet column detection in Excel importer

CRITICAL FIX for Entity_* placeholder names in multi-sheet Excel imports

Root Cause:
- Column detection ran globally on first row of all combined sheets
- Different sheets have different column structures (Term vs Name, etc.)
- Concepts sheet: [Term, Definition] → detected 'Term' column ✅
- Characters sheet: [Name, Description] → looked for 'Term' column ❌
- Result: Characters/Places/Other fell back to Entity_* placeholders

Fix:
- Group rows by sheet (_sheet field)
- Detect columns per-sheet, not globally
- Each sheet now uses its own column mapping
- Characters/Places sheets now correctly find 'Name' column

Impact:
- Concepts: Still work (no change)
- Characters/Places/Other: NOW USE ACTUAL NAMES! 🎉

Also removed debug logging from v4.8.5 (performance overhead)

Fixes: Workshop File Explorer showing Entity_* instead of real names
Ref: BRAINY_V4.8.4_VFS_UNDEFINED_NAMES_BUG.md

src/brainy.ts

@@ -573,14 +573,6 @@ 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,
@@ -600,13 +592,6 @@ 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
   }
 

src/importers/SmartExcelImporter.ts

@@ -227,8 +227,25 @@ export class SmartExcelImporter {
       return this.emptyResult(startTime)
     }
 
-    // Detect column names
-    const columns = this.detectColumns(rows[0], opts)
+    // CRITICAL FIX (v4.8.6): Detect columns per-sheet, not globally
+    // Different sheets may have different column structures (Term vs Name, etc.)
+    // Group rows by sheet and detect columns for each sheet separately
+    const rowsBySheet = new Map<string, typeof rows>()
+    for (const row of rows) {
+      const sheet = row._sheet || 'default'
+      if (!rowsBySheet.has(sheet)) {
+        rowsBySheet.set(sheet, [])
+      }
+      rowsBySheet.get(sheet)!.push(row)
+    }
+
+    // Detect columns for each sheet
+    const columnsBySheet = new Map<string, ReturnType<typeof this.detectColumns>>()
+    for (const [sheet, sheetRows] of rowsBySheet) {
+      if (sheetRows.length > 0) {
+        columnsBySheet.set(sheet, this.detectColumns(sheetRows[0], opts))
+      }
+    }
 
     // Process each row with BATCHED PARALLEL PROCESSING (v3.38.0)
     const extractedRows: ExtractedRow[] = []
@@ -252,6 +269,10 @@ export class SmartExcelImporter {
         chunk.map(async (row, chunkIndex) => {
           const i = chunkStart + chunkIndex
 
+          // CRITICAL FIX (v4.8.6): Use sheet-specific column mapping
+          const sheet = row._sheet || 'default'
+          const columns = columnsBySheet.get(sheet) || this.detectColumns(row, opts)
+
           // Extract data from row
           const term = this.getColumnValue(row, columns.term) || `Entity_${i}`
           const definition = this.getColumnValue(row, columns.definition) || ''

src/vfs/PathResolver.ts

@@ -230,7 +230,6 @@ export class PathResolver {
       from: dirId,
       type: VerbType.Contains
     })
-    console.log(`[DEBUG PathResolver] getChildren(${dirId}): Found ${relations.length} Contains relations`)
 
     const validChildren: VFSEntity[]= []
     const childNames = new Set<string>()
@@ -238,24 +237,12 @@ export class PathResolver {
     // Fetch all child entities via relationships
     for (const relation of relations) {
       const entity = await this.brain.get(relation.to)
-      console.log(`[DEBUG PathResolver] Retrieved entity ${relation.to}:`, {
-        exists: !!entity,
-        type: entity?.type,
-        hasMetadata: !!entity?.metadata,
-        metadataKeys: entity?.metadata ? Object.keys(entity.metadata) : [],
-        metadata_vfsType: entity?.metadata?.vfsType,
-        metadata_name: entity?.metadata?.name
-      })
-
       if (entity && entity.metadata?.vfsType && entity.metadata?.name) {
         validChildren.push(entity as VFSEntity)
         childNames.add(entity.metadata.name)
-      } else {
-        console.log(`[DEBUG PathResolver] ❌ FILTERED OUT entity ${relation.to} - missing vfsType or name`)
       }
     }
 
-    console.log(`[DEBUG PathResolver] Returning ${validChildren.length} valid children (filtered from ${relations.length})`)
     // Update cache
     this.parentCache.set(dirId, childNames)
     return validChildren

src/vfs/VirtualFileSystem.ts

@@ -846,20 +846,6 @@ 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) {
@@ -884,17 +870,12 @@ export class VirtualFileSystem implements IVirtualFileSystem {
 
     // Return appropriate format
     if (options?.withFileTypes) {
-      const result = children.map(child => ({
+      return 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)