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/servo_control.py

@@ -0,0 +1,23 @@
+import re
+from . import BaseValidator
+
+class ServoValidator(BaseValidator):
+    def validate(self, code: str, hardware: str, user_message: str) -> list[dict]:
+        issues = []
+        
+        # Check 14: State Machine for Weapons (Combat Protocol)
+        if "weapon" in user_message.lower() or "combat" in user_message.lower() or "state machine" in user_message.lower():
+            if "enum" not in code and "bool isArmed" not in code:
+                 issues.append({
+                    "severity": "error",
+                    "message": "Combat code requires a State Machine (enum State or bool isArmed).",
+                    "fix": lambda c: c.replace("void setup", "\n// [AUTO-FIX] State Machine\nenum State { DISARMED, ARMING, ARMED, FIRING };\nState currentState = DISARMED;\nunsigned long stateTimer = 0;\n\nvoid setup") if "void setup" in c else "// [AUTO-FIX] State Machine\nenum State { DISARMED, ARMING, ARMED, FIRING };\nState currentState = DISARMED;\n" + c
+                })
+            
+            if "Serial.read" not in code and "Serial.available" not in code:
+                 issues.append({
+                    "severity": "error",
+                    "message": "Missing Serial Command handling (e.g., 'A' to Arm).",
+                    "fix": lambda c: c.replace("void loop() {", "void loop() {\n  if (Serial.available()) {\n    char cmd = Serial.read();\n    // Handle commands\n  }\n")
+                })
+        return issues