chore: recovery checkpoint - v3.0 API successfully recovered

CRITICAL CHECKPOINT - DO NOT PUSH TO GITHUB

Recovery Status:
- Successfully recovered brainy.ts from compiled JavaScript
- All core v3.0 API methods functional (add, get, update, delete, relate, find, etc.)
- Neural subsystem intact (562KB embedded patterns, NLP working)
- Augmentation pipeline operational (20+ augmentations)
- HNSW clustering system complete
- Triple Intelligence compiled (needs constructor fix)
- Test suite validates functionality

Changes preserved:
- 898 files with changes from last 3 days
- 144,475 insertions
- All augmentation improvements
- All test coverage enhancements
- Complete v3.0 feature set

This is a LOCAL checkpoint only - contains recovered work after corruption incident.
Created backup in .backups/brainy-full-20250910-151314.tar.gz

Branch: recovery-checkpoint-20250910-151433
Date: Wed Sep 10 03:18:04 PM PDT 2025

.recovery-workspace/dist-backup-20250910-141917/utils/metadataIndexCache.d.ts

@@ -0,0 +1,60 @@
+/**
+ * MetadataIndexCache - Caches metadata index data for improved performance
+ * Reuses the same pattern as SearchCache for consistency
+ */
+export interface MetadataCacheEntry {
+    data: any;
+    timestamp: number;
+    hits: number;
+}
+export interface MetadataIndexCacheConfig {
+    maxAge?: number;
+    maxSize?: number;
+    enabled?: boolean;
+    hitCountWeight?: number;
+}
+export declare class MetadataIndexCache {
+    private cache;
+    private maxAge;
+    private maxSize;
+    private enabled;
+    private hitCountWeight;
+    private hits;
+    private misses;
+    private evictions;
+    constructor(config?: MetadataIndexCacheConfig);
+    /**
+     * Get cached entry
+     */
+    get(key: string): any | undefined;
+    /**
+     * Set cache entry
+     */
+    set(key: string, data: any): void;
+    /**
+     * Evict least valuable entry based on age and hit count
+     */
+    private evictLeastValuable;
+    /**
+     * Invalidate cache entries matching a pattern
+     */
+    invalidatePattern(pattern: string): void;
+    /**
+     * Clear all cache entries
+     */
+    clear(): void;
+    /**
+     * Get cache statistics
+     */
+    getStats(): {
+        size: number;
+        hits: number;
+        misses: number;
+        hitRate: number;
+        evictions: number;
+    };
+    /**
+     * Get estimated memory usage
+     */
+    getMemoryUsage(): number;
+}