[xunyoyo]

Summary

• add test-only splitwise helper methods to InspectableConnector for backlog detection and innode dispatch
• prefer dispatching to ready innode queues in tests to reflect current SplitwiseConnector behaviour

Testing

• pytest -c tests/cov_pytest.ini tests/splitwise/test_splitwise_connector.py
• python -m coverage run -m pytest -c tests/cov_pytest.ini tests/splitwise/test_splitwise_connector.py
• python -m coverage report -m --include='fastdeploy/splitwise/splitwise_connector.py'
• pre-commit run --all-files (fails: existing flake8 E202 in fastdeploy/eplb/experts_manager.py; clang-format hook attempts to reformat many files)

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Codex Task