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/__init__.py

@@ -0,0 +1,63 @@
+from typing import List, Dict
+
+class BaseValidator:
+    def validate(self, code: str, hardware: str, user_message: str) -> List[Dict]:
+        """Return a list of issues found."""
+        return []
+
+    def find_line(self, code: str, substring: str) -> int:
+        for i, line in enumerate(code.splitlines(), 1):
+            if substring in line:
+                return i
+        return -1
+
+from .esp32_basics import ESP32Validator
+from .motor_control import MotorValidator
+from .servo_control import ServoValidator
+from .memory_safety import MemoryValidator
+from .forge_theory import ForgeTheoryValidator
+from .timing_safety import TimingValidator
+from .arduino_compat import ArduinoValidator
+from .style_guide import StyleValidator
+from typing import List, Dict
+
+class BaseValidator:
+    def validate(self, code: str, hardware: str, user_message: str) -> List[Dict]:
+        """Return a list of issues found."""
+        return []
+
+    def find_line(self, code: str, substring: str) -> int:
+        for i, line in enumerate(code.splitlines(), 1):
+            if substring in line:
+                return i
+        return -1
+
+from .esp32_basics import ESP32Validator
+from .motor_control import MotorValidator
+from .servo_control import ServoValidator
+from .memory_safety import MemoryValidator
+from .forge_theory import ForgeTheoryValidator
+from .timing_safety import TimingValidator
+from .arduino_compat import ArduinoValidator
+from .style_guide import StyleValidator
+from typing import List, Dict
+
+class BaseValidator:
+    def validate(self, code: str, hardware: str, user_message: str) -> List[Dict]:
+        """Return a list of issues found."""
+        return []
+
+    def find_line(self, code: str, substring: str) -> int:
+        for i, line in enumerate(code.splitlines(), 1):
+            if substring in line:
+                return i
+        return -1
+
+from .esp32_basics import ESP32Validator
+from .motor_control import MotorValidator
+from .servo_control import ServoValidator
+from .memory_safety import MemoryValidator
+from .forge_theory import ForgeTheoryValidator
+from .timing_safety import TimingValidator
+from .arduino_compat import ArduinoValidator
+from .style_guide import StyleValidator