- Extend ProvenanceNode in semantica/explorer/schemas.py with audit evidence fields: source_document, source_location, source_quote, confidence, and checksum.
- Update _transform_audit_lineage in semantica/explorer/routes/provenance.py to populate these evidence fields for each lineage node from ProvenanceEntry records, while keeping default None values for orphan nodes.
- Include source_document, confidence, and checksum in markdown report rendering (_render_markdown) so exported markdown reports surface attribution and integrity evidence.
- Add unit test test_provenance_audit_evidence_fields_preserved in test_provenance_manager_wiring.py verifying that evidence fields are present across /api/provenance JSON responses and exported JSON/markdown reports.