- Add `from ..config import Config` import
- Convert `_to_dict` from @staticmethod to @classmethod; it now opens a
fresh session to populate `ontology` and `graph_id` from OntologyModel
and GraphModel respectively
- Use `db.expunge(proj)` before closing sessions in create_project,
get_project and list_projects so `_to_dict` can open its own session
without nesting conflicts (SQLite StaticPool safe)
- Add five new classmethods: save_ontology, get_ontology,
save_graph_record, get_latest_graph_external_id, complete_graph_record
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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