fix: improve ccproxy OAuth install hint (#55)

Co-authored-by: Dinos Papakostas <dinospk1999@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/test_ccproxy_manager.py

@@ -334,13 +334,30 @@ class TestMaybeStartCcproxy:
         mock_anthropic_env.assert_called_once()
         mock_codex_env.assert_called_once()
 
+    @patch("EvoScientist.ccproxy_manager._is_editable_install", return_value=True)
     @patch("EvoScientist.ccproxy_manager.is_ccproxy_available", return_value=False)
-    def test_openai_oauth_raises_no_binary(self, mock_avail):
+    def test_openai_oauth_raises_no_binary_editable(self, mock_avail, mock_edit):
         config = MagicMock()
         config.anthropic_auth_mode = "api_key"
         config.openai_auth_mode = "oauth"
-        with pytest.raises(RuntimeError, match="not found"):
+        with pytest.raises(RuntimeError) as exc_info:
             maybe_start_ccproxy(config)
+        msg = str(exc_info.value)
+        assert "ccproxy is required for OAuth mode but not found" in msg
+        assert "uv sync --extra oauth" in msg
+        assert "pip install -e '.[oauth]'" in msg
+
+    @patch("EvoScientist.ccproxy_manager._is_editable_install", return_value=False)
+    @patch("EvoScientist.ccproxy_manager.is_ccproxy_available", return_value=False)
+    def test_openai_oauth_raises_no_binary_pip(self, mock_avail, mock_edit):
+        config = MagicMock()
+        config.anthropic_auth_mode = "api_key"
+        config.openai_auth_mode = "oauth"
+        with pytest.raises(RuntimeError) as exc_info:
+            maybe_start_ccproxy(config)
+        msg = str(exc_info.value)
+        assert "ccproxy is required for OAuth mode but not found" in msg
+        assert "pip install 'evoscientist[oauth]'" in msg
 
     @patch(
         "EvoScientist.ccproxy_manager.check_ccproxy_auth",