feat: implement mvp with email-first login flow and langgraph architecture

tests/test_workflow_history.py

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+import pytest
+from ea_chatbot.history.manager import HistoryManager
+from ea_chatbot.history.models import User, Conversation, Message, Plot
+from ea_chatbot.config import Settings
+from sqlalchemy import delete
+
+@pytest.fixture
+def history_manager():
+    settings = Settings()
+    manager = HistoryManager(settings.history_db_url)
+    with manager.get_session() as session:
+        session.execute(delete(Plot))
+        session.execute(delete(Message))
+        session.execute(delete(Conversation))
+        session.execute(delete(User))
+    return manager
+
+def test_full_history_workflow(history_manager):
+    # 1. Create and Authenticate User
+    email = "e2e@example.com"
+    password = "password123"
+    history_manager.create_user(email, password, "E2E User")
+    
+    user = history_manager.authenticate_user(email, password)
+    assert user is not None
+    assert user.display_name == "E2E User"
+    
+    # 2. Create Conversation
+    conv = history_manager.create_conversation(user.id, "nj", "Test Analytics")
+    assert conv.id is not None
+    
+    # 3. Add User Message
+    history_manager.add_message(conv.id, "user", "How many voters in NJ?")
+    
+    # 4. Add Assistant Message with Plot
+    plot_data = b"fake_png_data"
+    history_manager.add_message(
+        conv.id, 
+        "assistant", 
+        "There are X voters.", 
+        plots=[plot_data]
+    )
+    
+    # 5. Retrieve and Verify History
+    messages = history_manager.get_messages(conv.id)
+    assert len(messages) == 2
+    assert messages[0].role == "user"
+    assert messages[1].role == "assistant"
+    assert len(messages[1].plots) == 1
+    assert messages[1].plots[0].image_data == plot_data
+    
+    # 6. Verify Conversation listing
+    convs = history_manager.get_conversations(user.id, "nj")
+    assert len(convs) == 1
+    assert convs[0].name == "Test Analytics"
+    
+    # 7. Update summary
+    history_manager.update_conversation_summary(conv.id, "Voter count analysis")
+    
+    # 8. Reload and verify summary
+    updated_convs = history_manager.get_conversations(user.id, "nj")
+    assert updated_convs[0].summary == "Voter count analysis"