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/critical/model-guardian.d.ts

@@ -0,0 +1,60 @@
+/**
+ * MODEL GUARDIAN - CRITICAL PATH
+ *
+ * THIS IS THE MOST CRITICAL COMPONENT OF BRAINY
+ * Without the exact model, users CANNOT access their data
+ *
+ * Requirements:
+ * 1. Model MUST be Xenova/all-MiniLM-L6-v2 (never changes)
+ * 2. Model MUST be available at runtime
+ * 3. Model MUST produce consistent 384-dim embeddings
+ * 4. System MUST fail fast if model unavailable in production
+ */
+export declare class ModelGuardian {
+    private static instance;
+    private isVerified;
+    private modelPath;
+    private lastVerification;
+    private constructor();
+    static getInstance(): ModelGuardian;
+    /**
+     * CRITICAL: Verify model availability and integrity
+     * This MUST be called before any embedding operations
+     */
+    ensureCriticalModel(): Promise<void>;
+    /**
+     * Verify the local model files exist and are correct
+     */
+    private verifyLocalModel;
+    /**
+     * Compute SHA256 hash of a file
+     */
+    private computeFileHash;
+    /**
+     * Download model from a fallback source
+     */
+    private downloadFromSource;
+    /**
+     * Configure transformers.js to use verified local model
+     */
+    private configureTransformers;
+    /**
+     * Detect where models should be stored
+     */
+    private detectModelPath;
+    /**
+     * Get model status for diagnostics
+     */
+    getStatus(): Promise<{
+        verified: boolean;
+        path: string;
+        lastVerification: Date | null;
+        modelName: string;
+        dimensions: number;
+    }>;
+    /**
+     * Force re-verification (for testing)
+     */
+    forceReverify(): Promise<void>;
+}
+export declare const modelGuardian: ModelGuardian;