fix(counts): counts.byType({ excludeVFS: true }) now returns correct type counts

Root cause: lazyLoadCounts() was reading from stats.nounCount (SERVICE-keyed)
instead of the sparse index (TYPE-keyed), and had a race condition (not awaited).

Changes:
- Fix lazyLoadCounts() to compute counts from 'noun' sparse index
- Move lazyLoadCounts() call from constructor to init() (properly awaited)
- Add getNounCountsByType()/getVerbCountsByType() getters to BaseStorage
- Add regression tests (7 tests)

Fixes Workshop bug where counts.byType({ excludeVFS: true }) returned {}
even when 48 entities existed in the database.

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

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

src/storage/baseStorage.ts

@@ -2439,6 +2439,24 @@ export abstract class BaseStorage extends BaseStorageAdapter {
     await this.writeObjectToPath(`${SYSTEM_DIR}/type-statistics.json`, stats)
   }
 
+  /**
+   * Get noun counts by type (O(1) access to type statistics)
+   * v6.2.2: Exposed for MetadataIndexManager to use as single source of truth
+   * @returns Uint32Array indexed by NounType enum value (42 types)
+   */
+  public getNounCountsByType(): Uint32Array {
+    return this.nounCountsByType
+  }
+
+  /**
+   * Get verb counts by type (O(1) access to type statistics)
+   * v6.2.2: Exposed for MetadataIndexManager to use as single source of truth
+   * @returns Uint32Array indexed by VerbType enum value (127 types)
+   */
+  public getVerbCountsByType(): Uint32Array {
+    return this.verbCountsByType
+  }
+
   /**
    * Rebuild type counts from actual storage (v5.5.0)
    * Called when statistics are missing or inconsistent