fix: correct typo in README major updates section

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

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

tests/base-hnsw-test.ts

@@ -0,0 +1,47 @@
+// Test using base HNSW directly
+import { HNSWIndex } from '../dist/hnsw/hnswIndex.js'
+import { euclideanDistance } from '../dist/utils/distance.js'
+
+async function testBaseHNSW() {
+  console.log('🧪 Testing base HNSW directly...')
+  
+  const index = new HNSWIndex(
+    { M: 4, efConstruction: 20, efSearch: 50 },
+    euclideanDistance
+  )
+  
+  // Create test vectors
+  const aliceVector = Array.from({length: 384}, () => Math.random())
+  const bobVector = Array.from({length: 384}, () => Math.random())
+  const queryVector = Array.from({length: 384}, () => Math.random())
+  
+  // Add items to index
+  const aliceId = 'alice-123'
+  const bobId = 'bob-456'
+  
+  await index.addItem({ id: aliceId, vector: aliceVector })
+  await index.addItem({ id: bobId, vector: bobVector })
+  
+  console.log('Added items to index')
+  
+  // Test without filter
+  const allResults = await index.search(queryVector, 10)
+  console.log('All results:', allResults.length)
+  
+  // Test with filter - only allow Alice
+  const aliceOnlyFilter = async (id: string) => {
+    console.log('🔍 Filter called for:', id, id === aliceId ? '✅ ALLOW' : '❌ BLOCK')
+    return id === aliceId
+  }
+  
+  console.log('Testing with filter...')
+  const filteredResults = await index.search(queryVector, 10, aliceOnlyFilter)
+  console.log('Filtered results:', filteredResults.length)
+  
+  const shouldWork = filteredResults.length === 1 && filteredResults[0][0] === aliceId
+  console.log(shouldWork ? '✅ FILTERING WORKS!' : '❌ FILTERING FAILED!')
+  
+  return shouldWork
+}
+
+testBaseHNSW().catch(console.error)