Add unit tests for analytics, fallback client, and refactored validators

- Implemented comprehensive unit tests for the BuddAI Analytics module, covering fallback statistics calculations.
- Created tests for the FallbackClient to ensure proper escalation to various AI models and handling of missing API keys.
- Developed unit tests for the refactored validator system, validating various hardware and coding standards.
- Established a base validator interface and implemented specific validators for ESP32, Arduino, motor control, memory safety, and more.
- Enhanced the validator registry to auto-discover and manage validators effectively.
- Included detailed validation logic for common issues in embedded systems programming, such as unused variables, safety timeouts, and coding style violations.

validators/forge_theory.py

@@ -0,0 +1,6 @@
+from . import BaseValidator
+
+class ForgeTheoryValidator(BaseValidator):
+    def validate(self, code: str, hardware: str, user_message: str) -> list[dict]:
+        # Placeholder for exponential decay validation
+        return []