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/api/SecurityAPI.d.ts

@@ -0,0 +1,50 @@
+/**
+ * Security API for Brainy 3.0
+ * Provides encryption, decryption, hashing, and secure storage
+ */
+export declare class SecurityAPI {
+    private config?;
+    private encryptionKey?;
+    constructor(config?: {
+        encryptionKey?: string;
+    } | undefined);
+    /**
+     * Encrypt data using AES-256-CBC
+     */
+    encrypt(data: string): Promise<string>;
+    /**
+     * Decrypt data encrypted with encrypt()
+     */
+    decrypt(encryptedData: string): Promise<string>;
+    /**
+     * Create a one-way hash of data (for passwords, etc)
+     */
+    hash(data: string, algorithm?: 'sha256' | 'sha512'): Promise<string>;
+    /**
+     * Compare data with a hash (for password verification)
+     */
+    compare(data: string, hash: string, algorithm?: 'sha256' | 'sha512'): Promise<boolean>;
+    /**
+     * Generate a secure random token
+     */
+    generateToken(bytes?: number): Promise<string>;
+    /**
+     * Derive a key from a password using PBKDF2
+     * Note: Simplified version using hash instead of PBKDF2 which may not be available
+     */
+    deriveKey(password: string, salt?: string, iterations?: number): Promise<{
+        key: string;
+        salt: string;
+    }>;
+    /**
+     * Sign data with HMAC
+     */
+    sign(data: string, secret?: string): Promise<string>;
+    /**
+     * Verify HMAC signature
+     */
+    verify(data: string, signature: string, secret: string): Promise<boolean>;
+    private hexToBytes;
+    private bytesToHex;
+    private constantTimeCompare;
+}