fix: metadata explosion bug - 69K files reduced to ~1K

Critical fix for metadata indexing that was creating 60+ chunk files per entity.

Root cause: Vector embeddings (384-dimensional arrays) were being indexed in
metadata, causing each dimension to create a separate chunk file with numeric
field names ("0", "1", "2", etc.).

Changes:
- Modified extractIndexableFields() to exclude vector/embedding fields
- Added NEVER_INDEX set: ['vector', 'embedding', 'embeddings', 'connections']
- Added safety check to skip arrays > 10 elements
- Preserves small array indexing (tags, categories, roles)

Impact:
- Reduces metadata files from 69,429 → ~1,200 (58x reduction)
- Fixes server initialization hangs
- Fixes metadata batch loading stalling at batch 23
- Fixes VFS getDescendants() hanging with large datasets
- Fixes Graph View UI not loading

Test Results:
- 7/7 integration tests passing
- Verified: 6 chunk files for 10 entities (was 7,210 before fix)
- 611/622 unit tests passing

Files Modified:
- src/utils/metadataIndex.ts - Core fix
- src/coreTypes.ts - HNSWVerb type enforcement with VerbType enum
- src/storage/adapters/* - Include core relational fields in HNSWVerb
- src/storage/adapters/baseStorageAdapter.ts - Type enforcement (HNSWNoun, GraphVerb)
- tests/integration/metadata-vector-exclusion.test.ts - Comprehensive test coverage

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

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

src/storage/adapters/memoryStorage.ts

@@ -289,10 +289,19 @@ export class MemoryStorage extends BaseStorage {
     const isNew = !this.verbs.has(verb.id)
 
     // Create a deep copy to avoid reference issues
+    // ARCHITECTURAL FIX (v3.50.1): Include core relational fields
     const verbCopy: HNSWVerb = {
       id: verb.id,
       vector: [...verb.vector],
-      connections: new Map()
+      connections: new Map(),
+
+      // CORE RELATIONAL DATA
+      verb: verb.verb,
+      sourceId: verb.sourceId,
+      targetId: verb.targetId,
+
+      // User metadata (if any)
+      metadata: verb.metadata
     }
 
     // Copy connections
@@ -321,10 +330,19 @@ export class MemoryStorage extends BaseStorage {
     }
 
     // Return a deep copy of the HNSWVerb
+    // ARCHITECTURAL FIX (v3.50.1): Include core relational fields
     const verbCopy: HNSWVerb = {
       id: verb.id,
       vector: [...verb.vector],
-      connections: new Map()
+      connections: new Map(),
+
+      // CORE RELATIONAL DATA
+      verb: verb.verb,
+      sourceId: verb.sourceId,
+      targetId: verb.targetId,
+
+      // User metadata
+      metadata: verb.metadata
     }
 
     // Copy connections
@@ -332,14 +350,7 @@ export class MemoryStorage extends BaseStorage {
       verbCopy.connections.set(level, new Set(connections))
     }
 
-    // Get metadata (relationship data in 2-file system)
-    const metadata = await this.getVerbMetadata(id)
-
-    // Combine into complete verb object
-    return {
-      ...verbCopy,
-      metadata: metadata || {}
-    }
+    return verbCopy
   }
 
   /**