Release v1.2.0

Fix logger_setup script name leakage (#5)

Summary

• stop logger_setup(script_name=...) from leaking SCRIPT_NAME into later calls in the same process
• update the dev-tools help and README to document the corrected logging behavior and valid CodeMapGenerator example
• add regression tests for logger script-name handling and the CLI help example

Testing

• venv\Scripts\python -m pytest src/tests/test_logger_settings.py src/tests/test_cli_help.py -v

Notes

• includes supporting research notes for stdlib logging file strategies used by this change