fix: correct typo in README major updates section

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/simple-metadata-test.ts

@@ -0,0 +1,51 @@
+// Simple standalone test to check metadata filtering
+import { BrainyData } from '../dist/brainyData.js'
+
+async function testMetadataFiltering() {
+  console.log('Creating BrainyData instance...')
+  const brainy = new BrainyData({
+    storage: { forceMemoryStorage: true },
+    hnsw: { M: 4, efConstruction: 20 },
+    logging: { verbose: true }
+  })
+  
+  console.log('Initializing...')
+  await brainy.init()
+  
+  console.log('Adding test data...')
+  await brainy.add('Senior developer Alice', { level: 'senior', name: 'Alice' })
+  await brainy.add('Junior developer Bob', { level: 'junior', name: 'Bob' })
+  
+  console.log('Searching without filter...')
+  const allResults = await brainy.searchText('developer', 10)
+  console.log('All results:', allResults.map(r => ({
+    metadata: r.metadata,
+    score: r.score.toFixed(3)
+  })))
+  
+  // Check if metadata index is available
+  console.log('Metadata index available?', !!brainy.metadataIndex)
+  
+  console.log('Searching with metadata filter...')
+  const seniorResults = await brainy.searchText('developer', 10, {
+    metadata: { level: 'senior' }
+  })
+  console.log('Senior results:', seniorResults.map(r => ({
+    metadata: r.metadata,
+    score: r.score.toFixed(3)
+  })))
+  
+  if (brainy.metadataIndex) {
+    console.log('Checking metadata index for level:senior...')
+    const levelSeniorIds = await brainy.metadataIndex.getIds('level', 'senior')
+    console.log('IDs with level=senior from index:', levelSeniorIds)
+    
+    const levelJuniorIds = await brainy.metadataIndex.getIds('level', 'junior')  
+    console.log('IDs with level=junior from index:', levelJuniorIds)
+  }
+  
+  console.log(`\nResults: All=${allResults.length}, Senior=${seniorResults.length}`)
+  console.log('Filter working?', seniorResults.length < allResults.length)
+}
+
+testMetadataFiltering().catch(console.error)