Add README for BuddAI v4.0 - Personal Data-driven Exocortex Intelligence

- Introduced comprehensive documentation detailing features, capabilities, and architecture of BuddAI v4.0.
- Highlighted the symbiotic relationship between user and AI, emphasizing personalized learning and memory retention.
- Included validation results showcasing 90% accuracy across various coding tasks.
- Documented the journey of development and validation from December 2025 to January 2026.
- Outlined business value, commercialization potential, and future roadmap for enhancements.

buddai_logic.py

@@ -4,6 +4,8 @@ from pathlib import Path
 from datetime import datetime, timedelta
 from typing import Optional, List, Dict, Tuple, Union, Generator
 
+from buddai_shared import DB_PATH
+
 class CodeValidator:
     """Validate generated code before showing to user"""