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/augmentations/indexAugmentation.d.ts

@@ -0,0 +1,120 @@
+/**
+ * Index Augmentation - Optional Metadata Indexing
+ *
+ * Replaces the hardcoded MetadataIndex in Brainy with an optional augmentation.
+ * Provides O(1) metadata filtering and field lookups.
+ *
+ * Zero-config: Automatically enabled for better search performance
+ * Can be disabled or customized via augmentation registry
+ */
+import { BaseAugmentation } from './brainyAugmentation.js';
+import { MetadataIndexManager } from '../utils/metadataIndex.js';
+export interface IndexConfig {
+    enabled?: boolean;
+    maxFieldValues?: number;
+    maxIndexSize?: number;
+    autoRebuild?: boolean;
+    rebuildThreshold?: number;
+    flushInterval?: number;
+}
+/**
+ * IndexAugmentation - Makes metadata indexing optional and pluggable
+ *
+ * Features:
+ * - O(1) metadata field lookups
+ * - Fast pre-filtering for searches
+ * - Automatic index maintenance
+ * - Zero-config with smart defaults
+ */
+export declare class IndexAugmentation extends BaseAugmentation {
+    readonly metadata: "readonly";
+    readonly name = "index";
+    readonly timing: "after";
+    operations: ("add" | "update" | "updateMetadata" | "delete" | "clear" | "all")[];
+    readonly priority = 60;
+    readonly category: "core";
+    readonly description = "Fast metadata field indexing for O(1) filtering and lookups";
+    private metadataIndex;
+    protected config: IndexConfig;
+    private flushTimer;
+    constructor(config?: IndexConfig);
+    protected onInitialize(): Promise<void>;
+    protected onShutdown(): Promise<void>;
+    /**
+     * Execute augmentation - maintain index on data operations
+     */
+    execute<T = any>(operation: string, params: any, next: () => Promise<T>): Promise<T>;
+    /**
+     * Handle add operation - index new metadata
+     */
+    private handleAdd;
+    /**
+     * Handle update operation - reindex metadata
+     */
+    private handleUpdate;
+    /**
+     * Handle delete operation - remove from index
+     */
+    private handleDelete;
+    /**
+     * Handle clear operation - clear index
+     */
+    private handleClear;
+    /**
+     * Start periodic flush timer
+     */
+    private startFlushTimer;
+    /**
+     * Get IDs that match metadata filter (for pre-filtering)
+     */
+    getIdsForFilter(filter: Record<string, any>): Promise<string[]>;
+    /**
+     * Get available values for a field
+     */
+    getFilterValues(field: string): Promise<any[]>;
+    /**
+     * Get all indexed fields
+     */
+    getFilterFields(): Promise<string[]>;
+    /**
+     * Get index statistics
+     */
+    getStats(): Promise<{
+        enabled: boolean;
+        totalEntries: number;
+        fieldsIndexed: never[];
+        memoryUsage: number;
+    } | {
+        totalEntries: number;
+        totalIds: number;
+        fieldsIndexed: string[];
+        lastRebuild: number;
+        indexSize: number;
+        enabled: boolean;
+        memoryUsage?: undefined;
+    }>;
+    /**
+     * Rebuild the index from storage
+     */
+    rebuild(): Promise<void>;
+    /**
+     * Flush index to storage
+     */
+    flush(): Promise<void>;
+    /**
+     * Add entry to index (public method for direct access)
+     */
+    addToIndex(id: string, metadata: Record<string, any>): Promise<void>;
+    /**
+     * Remove entry from index (public method for direct access)
+     */
+    removeFromIndex(id: string, metadata: Record<string, any>): Promise<void>;
+    /**
+     * Get the underlying MetadataIndexManager instance
+     */
+    getMetadataIndex(): MetadataIndexManager | null;
+}
+/**
+ * Factory function for zero-config index augmentation
+ */
+export declare function createIndexAugmentation(config?: IndexConfig): IndexAugmentation;