alice writes M1 content=v0-595aaa1d257d405caa85f009f2ab1477 on node-1
  M1 id=01aeba28-407b-4252-be5c-3409b94adad0
settle 5s for initial replication
alice + bob issue concurrent PUTs (vA=va-2f86eeafdfcb427d8316ba41ba042f5f from alice, vB=vb-93b62f0a667b456da082b58a0e4474b5 from bob)
  concurrent PUT results: [(0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'va-2f86eeafdfcb427d8316ba41ba042f5f', 'created_at': '2026-04-24T03:55:19.710571871+00:00', 'expires_at': '2026-05-01T03:55:19.710571871+00:00', 'id': '01aeba28-407b-4252-be5c-3409b94adad0', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-04-24T03:55:25.709212203+00:00'}, 'http_code': 200}), (0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'vb-93b62f0a667b456da082b58a0e4474b5', 'created_at': '2026-04-24T03:55:19.710571871+00:00', 'expires_at': '2026-05-01T03:55:19.710571871+00:00', 'id': '01aeba28-407b-4252-be5c-3409b94adad0', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-04-24T03:55:26.204177782+00:00'}, 'http_code': 200})]
settle 10s for quorum convergence
  node-1 sees content=vb-93b62f0a667b456da082b58a0e4474b5
  node-2 sees content=vb-93b62f0a667b456da082b58a0e4474b5
  node-3 sees content=vb-93b62f0a667b456da082b58a0e4474b5
  node-4 sees content=vb-93b62f0a667b456da082b58a0e4474b5