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/s3CompatibleStorage.ts

@@ -1515,12 +1515,19 @@ export class S3CompatibleStorage extends BaseStorage {
       // Convert connections Map to a serializable format
       // CRITICAL: Only save lightweight vector data (no metadata)
       // Metadata is saved separately via saveVerbMetadata() (2-file system)
+      // ARCHITECTURAL FIX (v3.50.1): Include core relational fields in verb vector file
       const serializableEdge = {
         id: edge.id,
         vector: edge.vector,
         connections: this.mapToObject(edge.connections, (set) =>
           Array.from(set as Set<string>)
-        )
+        ),
+
+        // CORE RELATIONAL DATA (v3.50.1+)
+        verb: edge.verb,
+        sourceId: edge.sourceId,
+        targetId: edge.targetId,
+
         // NO metadata field - saved separately for scalability
       }
 
@@ -1640,10 +1647,19 @@ export class S3CompatibleStorage extends BaseStorage {
           connections.set(Number(level), new Set(nodeIds as string[]))
         }
 
+        // ARCHITECTURAL FIX (v3.50.1): Return HNSWVerb with core relational fields
         const edge = {
           id: parsedEdge.id,
           vector: parsedEdge.vector,
-          connections
+          connections,
+
+          // CORE RELATIONAL DATA (read from vector file)
+          verb: parsedEdge.verb,
+          sourceId: parsedEdge.sourceId,
+          targetId: parsedEdge.targetId,
+
+          // User metadata (retrieved separately via getVerbMetadata())
+          metadata: parsedEdge.metadata
         }
 
         this.logger.trace(`Successfully retrieved edge ${id}`)