feat: add complete silent mode for TUI applications

- Add silent option to BrainyConfig to suppress ALL console output
- Override console methods (log, info, warn, error) when silent=true
- Add LogLevel.SILENT to Logger for proper silent mode support
- Propagate silent mode to all augmentations automatically
- Update augmentation configs to support silent property
- Restore console methods properly on brain.close()
- Perfect for terminal UI applications that need clean output

Usage:
```javascript
const brain = new Brainy({
  storage: { type: 'filesystem', path: './data' },
  silent: true  // Complete silence - zero console output
})
```

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

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

src/augmentations/display/types.ts

@@ -12,18 +12,21 @@ import type { VectorDocument, GraphVerb } from '../../coreTypes.js'
 export interface DisplayConfig {
   /** Enable/disable the augmentation */
   enabled: boolean
-  
+
   /** LRU cache size for computed display fields */
   cacheSize: number
-  
+
   /** Use lazy computation (recommended for performance) */
   lazyComputation: boolean
-  
+
   /** Batch processing size for multiple requests */
   batchSize: number
-  
+
   /** Minimum confidence threshold for AI type detection */
   confidenceThreshold: number
+
+  /** Silent mode - suppress all console output */
+  silent?: boolean
   
   // No icon configuration needed - clean, minimal approach