fix: resolve critical v5.0.0 metadata race condition

CRITICAL BUG FIX: TypeAwareStorage metadata race condition

Problem:
- saveNoun() called before saveNounMetadata()
- TypeAwareStorage couldn't determine entity type (not cached yet)
- Defaulted to 'thing' and saved to wrong storage path
- Later saveNounMetadata() saved to correct path
- Noun and metadata in different locations = entity not found

Impact:
- Broke VFS file operations completely
- Broke brain.get(), brain.relate(), brain.find()
- All metadata-dependent features failed
- Workshop team completely blocked

Solution:
- Reversed save order: saveNounMetadata() FIRST, then saveNoun()
- Type now cached before saveNoun() needs it
- Both saved to correct type-aware paths

Additional Fixes:
- Make baseStorage.initializeCOW() public (was protected)
- Remove enableCOW config option (cleanup)
- COW auto-init temporarily disabled (deadlock issue)

Known Limitations (v5.0.1):
- Fork API exists but COW requires manual init
- Will be zero-config in v5.1.0

Fixes: Workshop Bug Report (VFS metadata missing)

src/brainy.ts

@@ -177,6 +177,17 @@ export class Brainy<T = any> implements BrainyInterface<T> {
       this.storage = await this.setupStorage()
       await this.storage.init()
 
+      // v5.0.1: COW auto-init DISABLED due to initialization deadlock
+      // COW is still available but requires manual initialization
+      // Will be fixed properly in v5.1.0
+      // if (typeof (this.storage as any).initializeCOW === 'function') {
+      //   const cowOptions = (this.storage as any)._cowOptions || {
+      //     branch: 'main',
+      //     enableCompression: true
+      //   }
+      //   await (this.storage as any).initializeCOW(cowOptions)
+      // }
+
       // Setup index now that we have storage
       this.index = this.setupIndex()
 
@@ -406,7 +417,11 @@ export class Brainy<T = any> implements BrainyInterface<T> {
         ...(params.createdBy && { createdBy: params.createdBy })
       }
 
-      // v4.0.0: Save vector and metadata separately
+      // v5.0.1: Save metadata FIRST so TypeAwareStorage can cache the type
+      // This prevents the race condition where saveNoun() defaults to 'thing'
+      await this.storage.saveNounMetadata(id, storageMetadata)
+
+      // Then save vector
       await this.storage.saveNoun({
         id,
         vector,
@@ -414,8 +429,6 @@ export class Brainy<T = any> implements BrainyInterface<T> {
         level: 0
       })
 
-      await this.storage.saveNounMetadata(id, storageMetadata)
-
       // v4.8.0: Build entity structure for indexing (NEW - with top-level fields)
       const entityForIndexing = {
         id,
@@ -2131,9 +2144,10 @@ export class Brainy<T = any> implements BrainyInterface<T> {
 
       const clone = new Brainy<T>(forkConfig)
 
-      // Step 3: TRUE INSTANT FORK - Shallow copy indexes (O(1), <10ms)
-      // Share storage reference (already COW-enabled)
-      clone.storage = this.storage
+      // Step 3: Create NEW storage instance pointing to fork branch
+      // This ensures proper data isolation between parent and fork
+      clone.storage = await clone.setupStorage()
+      await clone.storage.init()
 
       // Shallow copy HNSW index (INSTANT - just copies Map references)
       clone.index = this.setupIndex()