Add comprehensive unit tests for BuddAI functionality

- Introduced 16 additional coverage tests in `test_additional_coverage.py` to enhance overall test coverage.
- Added 15 extended feature tests in `test_extended_features.py` to validate new functionalities.
- Implemented 27 final coverage tests in `test_final_coverage.py` to achieve a total of 100 tests.
- Created 2 fallback logic tests in `test_fallback_logic.py` to ensure proper fallback behavior based on confidence scores.
- Each test suite covers various aspects of the BuddAI system, including command handling, database interactions, and hardware detection.

test_fallback_logging.py

@@ -0,0 +1,93 @@
+#!/usr/bin/env python3
+"""
+Unit tests for BuddAI Fallback Logging
+Verifies that fallback prompts are logged to file.
+"""
+
+import unittest
+from unittest.mock import MagicMock, patch, mock_open
+import sys
+from pathlib import Path
+
+# Setup path
+REPO_ROOT = Path(__file__).parent.parent
+if str(REPO_ROOT) not in sys.path:
+    sys.path.insert(0, str(REPO_ROOT))
+
+from buddai_executive import BuddAI
+from core.buddai_shared import DATA_DIR
+
+class TestFallbackLogging(unittest.TestCase):
+    @patch('buddai_executive.OllamaClient')
+    @patch('buddai_executive.StorageManager')
+    @patch('buddai_executive.RepoManager')
+    def setUp(self, MockRepo, MockStorage, MockOllama):
+        # Suppress prints
+        with patch('builtins.print'):
+            self.ai = BuddAI(user_id="test_logging", server_mode=True)
+        
+        # Mock dependencies
+        self.ai.llm = MockOllama()
+        self.ai.storage = MockStorage()
+        self.ai.confidence_scorer = MagicMock()
+        self.ai.personality_manager = MagicMock()
+        self.ai.validator = MagicMock()
+        self.ai.hardware_profile = MagicMock()
+        self.ai.shadow_engine = MagicMock()
+        self.ai.shadow_engine.get_all_suggestions.return_value = []
+        
+        # Setup default mocks
+        self.ai.validator.validate.return_value = (True, [])
+        self.ai.hardware_profile.detect_hardware.return_value = "ESP32"
+        self.ai.extract_code = MagicMock(return_value=["void setup() {}"])
+
+    def test_fallback_logging(self):
+        """Test that fallback prompts are written to log file"""
+        # Configure Personality
+        self.ai.personality_manager.get_value.side_effect = lambda key, default=None: {
+            "enabled": True,
+            "confidence_threshold": 80,
+            "fallback_models": ["claude"],
+            "prompts": {
+                "claude": "Claude Prompt: {context}"
+            }
+        } if key == "ai_fallback" else default
+
+        # Low confidence
+        self.ai.confidence_scorer.calculate_confidence.return_value = 50
+        self.ai.confidence_scorer.should_escalate.return_value = True
+
+        # Mock LLM
+        self.ai.llm.query.return_value = "Code: ```cpp\nvoid setup() {}\n```"
+        
+        # Mock file opening
+        m = mock_open()
+        with patch('builtins.open', m):
+            self.ai.chat("fix logic")
+            
+        # Verify file write
+        log_path = DATA_DIR / "external_prompts.log"
+        m.assert_called_with(log_path, "a", encoding="utf-8")
+        handle = m()
+        
+        # Check if any write call contained the prompt
+        written_content = "".join(call.args[0] for call in handle.write.call_args_list)
+        self.assertIn("Claude Prompt: fix logic", written_content)
+        self.assertIn("MODEL: CLAUDE", written_content)
+
+    def test_logs_command(self):
+        """Test /logs command retrieves content"""
+        # Mock file existence and content
+        m = mock_open(read_data="Log Entry 1\nLog Entry 2")
+        
+        # We need to patch Path.exists as well since the code checks it
+        with patch('pathlib.Path.exists', return_value=True), \
+             patch('builtins.open', m):
+            
+            response = self.ai.handle_slash_command("/logs")
+            
+            self.assertIn("Log Entry 2", response)
+            self.assertIn("External Prompts Log", response)
+
+if __name__ == '__main__':
+    unittest.main()