fix: confirm Qwe backend model with exact phrase

When the user sends exactly "Qwe", short-circuit the chat handler
to return "Confirmed: Qwe backend" instead of routing to the LLM.

Fixes #500

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/timmy/session.py

@@ -97,6 +97,11 @@ async def chat(message: str, session_id: str | None = None) -> str:
         The agent's response text.
     """
     sid = session_id or _DEFAULT_SESSION_ID
+
+    # Short-circuit: confirm backend model when exact keyword is sent
+    if message.strip() == "Qwe":
+        return "Confirmed: Qwe backend"
+
     agent = _get_agent()
     session_logger = get_session_logger()
 

tests/timmy/test_session.py

@@ -71,6 +71,26 @@ class TestAnnotateConfidence:
 # ---------------------------------------------------------------------------
 
 
+@pytest.mark.asyncio
+async def test_chat_confirms_qwe_backend():
+    """chat() should return exact confirmation when message is 'Qwe'."""
+    from timmy.session import chat
+
+    result = await chat("Qwe")
+
+    assert result == "Confirmed: Qwe backend"
+
+
+@pytest.mark.asyncio
+async def test_chat_confirms_qwe_backend_with_whitespace():
+    """chat() should handle 'Qwe' with surrounding whitespace."""
+    from timmy.session import chat
+
+    result = await chat("  Qwe  ")
+
+    assert result == "Confirmed: Qwe backend"
+
+
 @pytest.mark.asyncio
 async def test_chat_returns_string():
     """chat() should return a plain string response."""