fix: CRITICAL systemic VFS metadata bug across ALL storage adapters (v4.7.4)

CRITICAL BUG FIX - Workshop Team Unblocked!

This hotfix resolves a systemic bug affecting ALL 7 storage adapters that
caused VFS queries to return empty results even when data existed.

Bug Pattern: `if (!metadata) continue` in getNouns()/getVerbs()
Impact: VFS queries returned empty arrays despite 577 relationships existing
Root Cause: Storage adapters skipped entities if metadata file read returned null

Fixes:
- storage: Fix metadata skip bug in 12 locations across 7 adapters
  (TypeAware, Memory, FileSystem, GCS, S3, R2, OPFS, Azure)
- neural: Fix SmartExtractor weighted score threshold (28 failures → 4)
- neural: Fix PatternSignal priority ordering
- api: Fix Brainy.relate() weight parameter not returned

Test Results:
- TypeAwareStorageAdapter: 17/17 passing (was 7 failures)
- SmartExtractor: 42/46 passing (was 28 failures)
- Neural clustering: 3/3 passing
- Brainy.relate(): 20/20 passing

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

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

src/storage/adapters/fileSystemStorage.ts

@@ -908,11 +908,11 @@ export class FileSystemStorage extends BaseStorage {
           const parsedNoun = JSON.parse(data)
 
           // v4.0.0: Load metadata from separate storage
+          // FIX v4.7.4: Don't skip nouns without metadata - metadata is optional in v4.0.0
           const metadata = await this.getNounMetadata(id)
-          if (!metadata) continue
 
           // Apply filter if provided
-          if (options.filter) {
+          if (options.filter && metadata) {
             let matches = true
             for (const [key, value] of Object.entries(options.filter)) {
               if (metadata[key] !== value) {
@@ -939,7 +939,7 @@ export class FileSystemStorage extends BaseStorage {
             vector: parsedNoun.vector,
             connections: connections,
             level: parsedNoun.level || 0,
-            metadata: metadata
+            metadata: (metadata || {}) as NounMetadata // Empty if none
           }
 
           items.push(nounWithMetadata)