feat: Complete major refactoring and add initial test suite

This commit addresses a large number of pending tasks from `Tasks.md`, focusing on architectural improvements, documentation consistency, and the introduction of a testing framework.

Key changes include:

- **Button Dispatcher Agent (`[IMP-003]`):** Refactored the button handling logic into a dedicated `ButtonDispatcher` class. This decouples the dispatcher from handlers and improves modularity.
- **Documentation Consistency (`[DOC-001]`):** Updated `AGENTS.md` and `Agent_skills.md` to be consistent with the current codebase, removing outdated information and "Fallo Actual" notes.
- **Code Quality Tools (`[TEST-002]`):** Added `black` to the project for consistent code formatting and applied it to the entire `bot/` directory.
- **Initial Test Coverage (`[TEST-001]`):** Created a `tests/` directory and implemented a comprehensive suite of unit tests for the critical `FlowEngine` module, using Python's `unittest` framework.
- **Task Verification:** Investigated and confirmed that tasks `[ARCH-003]` (Code Duplication), `[PERF-003]` (Flow Engine Memory Usage), and `[PERF-002]` (Voice File Memory Management) were already resolved by previous refactoring.
- **Updated `Tasks.md`:** Updated the status of all addressed tasks to reflect the project's current state.

tests/test_flow_engine.py

@@ -0,0 +1,99 @@
+import unittest
+from unittest.mock import patch, MagicMock
+import os
+import sys
+import json
+
+# Ensure the 'bot' module can be imported
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+
+from bot.modules.flow_engine import FlowEngine
+
+class TestFlowEngine(unittest.TestCase):
+
+    def setUp(self):
+        """Set up a mock database connection and a mock flow definition."""
+        self.mock_conn = MagicMock()
+        self.mock_cursor = MagicMock()
+        self.mock_conn.cursor.return_value = self.mock_cursor
+
+        self.mock_flow = {
+            "id": "test_flow",
+            "role": "client",
+            "steps": [
+                {"step_id": 1, "question": "What is your name?", "variable": "name"},
+                {"step_id": 2, "question": "What is your quest?", "variable": "quest"},
+                {"step_id": 3, "question": "What is your favorite color?", "variable": "color"}
+            ]
+        }
+
+        # Patch the database connection and the file loading
+        self.patcher_db = patch('bot.modules.flow_engine.get_db_connection', return_value=self.mock_conn)
+        self.patcher_load = patch('bot.modules.flow_engine.FlowEngine._load_flows', return_value=[self.mock_flow])
+
+        self.patcher_db.start()
+        self.patcher_load.start()
+
+        self.flow_engine = FlowEngine()
+
+    def tearDown(self):
+        """Stop the patchers."""
+        self.patcher_db.stop()
+        self.patcher_load.stop()
+
+    def test_start_flow(self):
+        """Test that a flow can be started correctly."""
+        user_id = 123
+        flow_id = "test_flow"
+
+        initial_step = self.flow_engine.start_flow(user_id, flow_id)
+
+        self.assertEqual(initial_step, self.mock_flow['steps'][0])
+        self.mock_cursor.execute.assert_called_once()
+        self.mock_conn.commit.assert_called_once()
+
+    def test_get_conversation_state_found(self):
+        """Test retrieving an existing conversation state."""
+        user_id = 123
+        db_row = {'flow_id': 'test_flow', 'current_step_id': 1, 'collected_data': '{"name": "Sir Lancelot"}'}
+        self.mock_cursor.fetchone.return_value = db_row
+
+        state = self.flow_engine.get_conversation_state(user_id)
+
+        self.assertEqual(state['flow_id'], 'test_flow')
+        self.assertEqual(state['current_step_id'], 1)
+        self.assertEqual(state['collected_data']['name'], 'Sir Lancelot')
+        self.mock_cursor.execute.assert_called_with("SELECT flow_id, current_step_id, collected_data FROM conversations WHERE user_id = ?", (user_id,))
+
+    def test_handle_response_in_progress(self):
+        """Test handling a response that leads to the next step."""
+        user_id = 123
+        self.flow_engine.start_flow(user_id, "test_flow")
+
+        # Mock the current state
+        state = {"flow_id": "test_flow", "current_step_id": 1, "collected_data": {}}
+        with patch.object(self.flow_engine, 'get_conversation_state', return_value=state):
+            result = self.flow_engine.handle_response(user_id, "Sir Galahad")
+
+            self.assertEqual(result['status'], 'in_progress')
+            self.assertEqual(result['step'], self.mock_flow['steps'][1])
+            self.assertEqual(state['collected_data']['name'], 'Sir Galahad')
+
+    def test_handle_response_flow_completion(self):
+        """Test handling the final response that completes a flow."""
+        user_id = 123
+
+        # Mock the state to be at the last step
+        state = {"flow_id": "test_flow", "current_step_id": 3, "collected_data": {"name": "Sir Robin", "quest": "To seek the Holy Grail"}}
+        with patch.object(self.flow_engine, 'get_conversation_state', return_value=state):
+            result = self.flow_engine.handle_response(user_id, "Blue")
+
+            self.assertEqual(result['status'], 'complete')
+            self.assertEqual(result['data']['color'], 'Blue')
+
+            # Check that the conversation is ended
+            self.mock_cursor.execute.assert_any_call("DELETE FROM conversations WHERE user_id = ?", (user_id,))
+            self.mock_conn.commit.assert_called()
+
+if __name__ == '__main__':
+    unittest.main()