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/universalDisplayAugmentation.ts

@@ -290,9 +290,14 @@ export class UniversalDisplayAugmentation extends BaseAugmentation {
    */
   private createExploreMethod(entity: any) {
     return async (): Promise<void> => {
+      // Respect silent mode
+      if (this.config.silent) {
+        return
+      }
+
       console.log(`\n📋 Entity Exploration: ${entity.id || 'unknown'}`)
       console.log('━'.repeat(50))
-      
+
       // Show user data
       console.log('\n👤 User Data:')
       const userData = entity.metadata || entity
@@ -313,7 +318,7 @@ export class UniversalDisplayAugmentation extends BaseAugmentation {
       } catch (error) {
         console.log(`  Error computing display fields: ${error}`)
       }
-      
+
       console.log('')
     }
   }