Adds create_dataset MCP tool that wraps POST /api/v1/dataset/ so skills and
agents can register an existing physical table as a Superset dataset without
manual UI interaction. Returns DatasetInfo (same shape as get_dataset_info)
so the resulting dataset_id feeds directly into generate_chart.
- CreateDatasetRequest schema (database_id, schema, table_name, owners?)
- Tool file with typed error handling (exists/not-found/validation/internal)
- Registered in dataset/tool/__init__.py and app.py
- DEFAULT_INSTRUCTIONS updated to list create_dataset
- Unit tests covering success, owners, error cases, and full DatasetInfo shape
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