This pull request makes several improvements and refactorings to enhance the handling of optional `summary` fields and overall schema generation in Snapcraft. ### Key Changes - **Dependency Updates:** - Updated `pyproject.toml` by replacing the `[project.optional-dependencies]` section with `[dependency-groups]`. - Removed the `keyring` dependency from the development packages. - **Schema Model Adjustments:** - Refactored the `ConfdbSchema` and related assertion models by removing explicit `summary` fields. This change ensures that optional summaries are only applied if necessary, aligning with updated specification expectations. - Removed the `Rules` export from the models where it was no longer needed, simplifying the API surface. - **YAML Generation Enhancements:** - Updated the YAML generation logic in the confdb schemas service to use a new template (`_CONFDB_SCHEMA_TEMPLATE`) for assembling YAML content. This refactoring includes support for ordered keys and a more concise representation of summary fields when present. - Replaced the use of a custom PyYAML dumper with `dump_yaml` from the existing utility module to achieve consistent formatting and key ordering. - **Test Suite Updates:** - Adjusted and simplified tests in `tests/unit/models/test_assertions.py` and `tests/unit/services/test_confdbs.py` to reflect the removal of explicit summary fields from models. - Ensured that marshalling functions correctly cast scalars to strings, consistent with the expected behavior. ### Impact These changes improve the clarity of the codebase and align the schema models with the updated specifications. Additionally, the updated YAML generation produces cleaner output that handles optional fields gracefully. All modifications adhere to the existing code style and have been validated with the full test suite to ensure no regressions occur. Please review the changes and provide any feedback or suggestions for further improvements. --- *Created with [Repobird.ai](https://repobird.ai) 📦🐦*