fix(tests): update import paths for Example and ExampleCollection

Module moved from msgflux.examples to msgflux.core.examples.

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

Author: vilsonrodrigues

tests/nn/modules/test_agent.py

@@ -7,7 +7,7 @@
 from msgflux.core.message import Message
 from msgflux.models.response import ModelResponse
 from msgflux.nn.modules.tool import ToolLibrary, ToolResponses, ToolCall
-from msgflux.examples import Example
+from msgflux.core.examples import Example
 
 
 @pytest.fixture

tests/test_examples.py

@@ -1,6 +1,6 @@
 import pytest
 
-from msgflux.examples import Example, ExampleCollection
+from msgflux.core.examples import Example, ExampleCollection
 
 
 @pytest.fixture