feat: comprehensive metadata namespace architecture and cleanup system

BREAKING CHANGE: Remove hard delete option from deleteVerb() for consistent API

- Add complete metadata namespace architecture with O(1) soft delete performance
- Implement periodic cleanup system for old soft-deleted items
- Add restore methods for both nouns and verbs
- Require metadata contracts for all augmentations
- Eliminate namespace collisions with clean separation (_brainy, _augmentations, _audit)
- Optimize index performance using flattened dot-notation for O(1) lookups
- Add comprehensive augmentation safety system with type-safe access control
- Maintain full backward compatibility for existing data
- Add enterprise-grade cleanup with configurable age thresholds and batch processing

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

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

src/augmentations/intelligentVerbScoringAugmentation.ts

@@ -66,6 +66,10 @@ interface ScoringMetrics {
 export class IntelligentVerbScoringAugmentation extends BaseAugmentation {
   name = 'IntelligentVerbScoring'
   timing = 'around' as const
+  readonly metadata = {
+    reads: ['type', 'verb', 'source', 'target'] as string[],
+    writes: ['weight', 'confidence', 'intelligentScoring'] as string[]
+  }  // Adds scoring metadata to verbs
   operations = ['addVerb', 'relate'] as ('addVerb' | 'relate')[]
   priority = 10 // Enhancement feature - runs after core operations