test: add patch_markdown_headings to messaging package export tests

- Update test expectations in test_messaging_init.py to include the new patch_markdown_headings function in the public API exports
- Add E402 lint ignore for code_puppy/messaging/__init__.py in pyproject.toml to allow for module-level imports that are part of the package's initialization logic

Author: mpfaffenberger

pyproject.toml

@@ -79,6 +79,7 @@ path = "code_puppy/models_dev_api.json"
 [tool.ruff.lint.per-file-ignores]
 "code_puppy/main.py" = ["E402"]
 "code_puppy/cli_runner.py" = ["E402"]
+"code_puppy/messaging/__init__.py" = ["E402"]
 
 [tool.pytest.ini_options]
 addopts = "--cov=code_puppy --cov-report=term-missing"

tests/test_messaging_init.py

@@ -163,6 +163,8 @@ def test_expected_export_count(self):
             "RichConsoleRenderer",
             "DEFAULT_STYLES",
             "DIFF_STYLES",
+            # Markdown patches
+            "patch_markdown_headings",
             # Session management
             "set_session_context",
             "get_session_context",