alice writes M1 content=v0-8d151a533cd0405aa549b84e187fb0ac on node-1
  M1 id=99235b29-b7d4-4697-9376-e355dfabcd88
settle 5s for initial replication
alice + bob issue concurrent PUTs (vA=va-b655cb7aec1e493082ac20d45c89b89e from alice, vB=vb-fc517c6dc612400eb5dd9859b68f4d93 from bob)
  concurrent PUT results: [(0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'va-b655cb7aec1e493082ac20d45c89b89e', 'created_at': '2026-05-02T19:05:38.432262299+00:00', 'expires_at': '2026-05-09T19:05:38.432262299+00:00', 'id': '99235b29-b7d4-4697-9376-e355dfabcd88', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-05-02T19:05:44.123347016+00:00'}, 'http_code': 200}), (0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'vb-fc517c6dc612400eb5dd9859b68f4d93', 'created_at': '2026-05-02T19:05:38.432262299+00:00', 'expires_at': '2026-05-09T19:05:38.432262299+00:00', 'id': '99235b29-b7d4-4697-9376-e355dfabcd88', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-05-02T19:05:44.234258773+00:00'}, 'http_code': 200})]
settle 10s for quorum convergence
  node-1 sees content=vb-fc517c6dc612400eb5dd9859b68f4d93
  node-2 sees content=vb-fc517c6dc612400eb5dd9859b68f4d93
  node-3 sees content=vb-fc517c6dc612400eb5dd9859b68f4d93
  node-4 sees content=vb-fc517c6dc612400eb5dd9859b68f4d93