test: update VFS where clause tests for correct field names

Tests now verify that where clauses work correctly with proper field names:
- Use 'path' instead of 'metadata.path'
- Use 'vfsType' instead of 'metadata.vfsType'

All tests passing - where clause fix verified ✅

tests/manual/vfs-where-clause-test.test.ts

@@ -0,0 +1,145 @@
+/**
+ * VFS Where Clause Diagnostic
+ *
+ * The real issue: brain.find({ where: { 'metadata.path': '/' } }) returns 0 results
+ * even though the root entity exists!
+ */
+
+import { describe, it, expect, beforeAll, afterAll } from 'vitest'
+import { Brainy } from '../../src/brainy.js'
+import * as fs from 'fs'
+import * as path from 'path'
+
+describe('VFS Where Clause Diagnostic', () => {
+  const testDir = path.join(process.cwd(), 'test-where-clause')
+  let brain: Brainy
+
+  beforeAll(async () => {
+    // Clean up
+    if (fs.existsSync(testDir)) {
+      fs.rmSync(testDir, { recursive: true, force: true })
+    }
+    fs.mkdirSync(testDir, { recursive: true })
+
+    brain = new Brainy({
+      storage: {
+        type: 'filesystem',
+        path: testDir
+      }
+    })
+    await brain.init()
+  })
+
+  afterAll(() => {
+    if (fs.existsSync(testDir)) {
+      fs.rmSync(testDir, { recursive: true, force: true })
+    }
+  })
+
+  it('should find root entity using where clause', async () => {
+    const vfs = brain.vfs()
+    await vfs.init()
+
+    // Method 1: Where clause (FIXED in v4.3.3!)
+    console.log('\n📋 Method 1: Where clause (CORRECT field names)')
+    const whereResult = await brain.find({
+      where: {
+        path: '/',           // ✅ Fixed: Use flat field name
+        vfsType: 'directory' // ✅ Fixed: Use flat field name
+      },
+      limit: 10
+    })
+    console.log(`   Found ${whereResult.length} entities`)
+
+    // Method 2: Find all and filter (what actually works)
+    console.log('\n📋 Method 2: Find all + filter')
+    const allEntities = await brain.find({ limit: 100 })
+    console.log(`   Total entities: ${allEntities.length}`)
+
+    const filtered = allEntities.filter(e =>
+      e.metadata?.path === '/' &&
+      e.metadata?.vfsType === 'directory'
+    )
+    console.log(`   Filtered to roots: ${filtered.length}`)
+
+    if (filtered.length > 0) {
+      console.log(`   Root entity:`)
+      console.log(`      ID: ${filtered[0].id}`)
+      console.log(`      Type: ${filtered[0].type}`)
+      console.log(`      Metadata.path: ${filtered[0].metadata?.path}`)
+      console.log(`      Metadata.vfsType: ${filtered[0].metadata?.vfsType}`)
+    }
+
+    // Method 3: Type-based search
+    console.log('\n📋 Method 3: Type query (collection)')
+    const typeResult = await brain.find({
+      type: 'collection',
+      limit: 10
+    })
+    console.log(`   Found ${typeResult.length} collection entities`)
+
+    // FIXED (v4.3.3): Where clause now works with correct field names!
+    expect(whereResult.length).toBe(1)  // ✅ WHERE CLAUSE WORKS NOW!
+    expect(filtered.length).toBe(1)     // ✅ MANUAL FILTER ALSO WORKS
+  })
+
+  it('should find regular VFS files using where clause', async () => {
+    const vfs = brain.vfs()
+    await vfs.mkdir('/test', { recursive: true })
+    await vfs.writeFile('/test/hello.txt', 'Hello World')
+
+    // Try to find the file using where clause (FIXED field names)
+    console.log('\n📋 Finding /test/hello.txt')
+
+    const whereResult = await brain.find({
+      where: {
+        path: '/test/hello.txt',  // ✅ Fixed: Use flat field name
+        vfsType: 'file'           // ✅ Fixed: Use flat field name
+      },
+      limit: 10
+    })
+    console.log(`   Where clause: ${whereResult.length} results`)
+
+    const allEntities = await brain.find({ limit: 100 })
+    const filtered = allEntities.filter(e =>
+      e.metadata?.path === '/test/hello.txt'
+    )
+    console.log(`   Manual filter: ${filtered.length} results`)
+
+    if (filtered.length > 0) {
+      console.log(`   File metadata:`)
+      console.log(`      Path: ${filtered[0].metadata?.path}`)
+      console.log(`      VfsType: ${filtered[0].metadata?.vfsType}`)
+      console.log(`      Name: ${filtered[0].metadata?.name}`)
+    }
+
+    // FIXED (v4.3.3): Where clause works with correct field names!
+    expect(whereResult.length).toBe(1)  // ✅ FIXED!
+    expect(filtered.length).toBe(1)     // ✅ ALSO WORKS
+  })
+
+  it('should show metadata index status', async () => {
+    console.log('\n📋 Metadata Index Status')
+
+    const allEntities = await brain.find({ limit: 100 })
+    console.log(`   Total entities: ${allEntities.length}`)
+
+    const withMetadata = allEntities.filter(e => e.metadata && Object.keys(e.metadata).length > 0)
+    console.log(`   With metadata: ${withMetadata.length}`)
+
+    const withPath = allEntities.filter(e => e.metadata?.path)
+    console.log(`   With metadata.path: ${withPath.length}`)
+
+    const withVfsType = allEntities.filter(e => e.metadata?.vfsType)
+    console.log(`   With metadata.vfsType: ${withVfsType.length}`)
+
+    // Show sample metadata
+    if (withPath.length > 0) {
+      console.log(`\n   Sample entity with path:`)
+      const sample = withPath[0]
+      console.log(`      ID: ${sample.id}`)
+      console.log(`      Type: ${sample.type}`)
+      console.log(`      Metadata keys: ${Object.keys(sample.metadata || {}).join(', ')}`)
+    }
+  })
+})