[Ref] set and unset command line tools should now modify the config file on disk

[g5t]

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[Copilot]

Pull request overview

This PR refactors the config_set and config_unset command-line tools to persist changes to the configuration file on disk, fixing a previous deficiency where these commands only modified in-memory configuration. The implementation adds helper functions to read and write YAML configuration files and includes comprehensive test coverage.

Key Changes:

• Added _get_config_yaml() and _save_config_yaml() helper functions to read and write configuration files
• Modified config_set() and config_unset() to accept an optional path parameter and persist changes to disk
• Added pyyaml dependency and Python 3.14 classifier to pyproject.toml

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/mccode_antlr/cli/management.py	Core implementation changes: added helper functions for YAML file I/O, modified config_set/config_unset to persist changes to disk, updated argument parsers to accept path parameter
tests/test_nested_key_issue.py	New test file to verify nested key preservation when setting configuration values
tests/test_config_unset_issue.py	New test file to verify key deletion while preserving other configuration keys
tests/test_cli_management.py	Comprehensive pytest test suite covering config and cache management functionality
pyproject.toml	Added pyyaml dependency and Python 3.14 classifier

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