alice writes M1 content=v0-61f381139df94a4f90e5590edc3ac250 on node-1
  M1 id=bc9e5fb8-2db8-46a7-84cb-a652bcfb315a
settle 5s for initial replication
alice + bob issue concurrent PUTs (vA=va-0982fc15035a4ea9aacdc9da44ae0fce from alice, vB=vb-d9140600b7924625af2000f6ac2c706c from bob)
  concurrent PUT results: [(0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'va-0982fc15035a4ea9aacdc9da44ae0fce', 'created_at': '2026-04-24T16:50:31.811971896+00:00', 'expires_at': '2026-05-01T16:50:31.811971896+00:00', 'id': 'bc9e5fb8-2db8-46a7-84cb-a652bcfb315a', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-04-24T16:50:36.959140624+00:00'}, 'http_code': 200}), (0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'vb-d9140600b7924625af2000f6ac2c706c', 'created_at': '2026-04-24T16:50:31.811971896+00:00', 'expires_at': '2026-05-01T16:50:31.811971896+00:00', 'id': 'bc9e5fb8-2db8-46a7-84cb-a652bcfb315a', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-04-24T16:50:36.960960920+00:00'}, 'http_code': 200})]
settle 10s for quorum convergence
  node-1 sees content=vb-d9140600b7924625af2000f6ac2c706c
  node-2 sees content=vb-d9140600b7924625af2000f6ac2c706c
  node-3 sees content=vb-d9140600b7924625af2000f6ac2c706c
  node-4 sees content=vb-d9140600b7924625af2000f6ac2c706c