alice writes M1 content=v0-5f4f56f02bc3478db2ca4e02ae1788f1 on node-1
  M1 id=4f23ea3d-26c2-4e6b-9851-ca0f2f82d73c
settle 5s for initial replication
alice + bob issue concurrent PUTs (vA=va-59fa89a8a893471f95bbfcb426d3d571 from alice, vB=vb-08e0de8fb7c14de2a54f52942e19b7c0 from bob)
  concurrent PUT results: [(0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'va-59fa89a8a893471f95bbfcb426d3d571', 'created_at': '2026-05-02T17:17:22.900919017+00:00', 'expires_at': '2026-05-09T17:17:22.900919017+00:00', 'id': '4f23ea3d-26c2-4e6b-9851-ca0f2f82d73c', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-05-02T17:17:29.113571766+00:00'}, 'http_code': 200}), (0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'vb-08e0de8fb7c14de2a54f52942e19b7c0', 'created_at': '2026-05-02T17:17:22.900919017+00:00', 'expires_at': '2026-05-09T17:17:22.900919017+00:00', 'id': '4f23ea3d-26c2-4e6b-9851-ca0f2f82d73c', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-05-02T17:17:29.076162526+00:00'}, 'http_code': 200})]
settle 10s for quorum convergence
  node-1 sees content=va-59fa89a8a893471f95bbfcb426d3d571
  node-2 sees content=va-59fa89a8a893471f95bbfcb426d3d571
  node-3 sees content=va-59fa89a8a893471f95bbfcb426d3d571
  node-4 sees content=va-59fa89a8a893471f95bbfcb426d3d571