- **docs:** Add `docs/provider_authoring.md` as a plugin authoring Quick Start for the strict `ResultTable` API (ResultModel/ColumnSpec/selection_fn). The file keeps its legacy name for compatibility.
- **docs:** Add a link from `docs/result_table.md` to the plugin authoring guide.
- **tests:** Add `tests/test_provider_author_examples.py` validating example plugin registration and adapter behavior. The test file keeps its legacy name for compatibility.