Salvaged from PR #1428 by jplew. Removes Athabasca-specific persistence guidance accidentally merged in PR #1422: - Drop Athabasca docstring and injected note from _enrich_message_with_vision - Delete tests/gateway/test_image_enrichment.py (asserted app-specific behavior) Co-authored-by: jplew <jplew@users.noreply.github.com>