fix: update all imports and references from BrainyData to Brainy

- Fixed imports in examples/tests/ to use correct Brainy import
- Fixed imports in tests/benchmarks/ to use correct paths
- Updated bin/brainy-interactive.js to use Brainy instead of BrainyData
- Corrected documentation references throughout codebase
- Removed duplicate imports in benchmark files
- All files now consistently use 'Brainy' class from dist/index.js

docs/METADATA_CONTRACT_IMPLEMENTATION.md

@@ -35,7 +35,7 @@ These augmentations don't read or write metadata at all:
 1. **CacheAugmentation** - Only caches search results
 2. **RequestDeduplicatorAugmentation** - Only deduplicates requests
 3. **ConnectionPoolAugmentation** - Only manages storage connections
-4. **StorageAugmentation** - Base storage layer, metadata handled by brainyData
+4. **StorageAugmentation** - Base storage layer, metadata handled by Brainy
 
 ### Category 2: Read-Only Access ('readonly')
 These augmentations read metadata but never modify it: