alice writes M1 content=v0-673609d31ad14cb9a0e7e1d888730950 on node-1
  M1 id=8405b06a-fbff-4134-8d54-40b7dd0cd28c
settle 5s for initial replication
alice + bob issue concurrent PUTs (vA=va-29d1153bcd7e4b13a9cd42c271fc0182 from alice, vB=vb-0b5fa400a2e14db481ae4b1a7c1ba0dc from bob)
  concurrent PUT results: [(0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'va-29d1153bcd7e4b13a9cd42c271fc0182', 'created_at': '2026-05-04T04:19:09.562235131+00:00', 'expires_at': '2026-05-11T04:19:09.562235131+00:00', 'id': '8405b06a-fbff-4134-8d54-40b7dd0cd28c', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-05-04T04:19:14.694841436+00:00'}, 'http_code': 200}), (0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'vb-0b5fa400a2e14db481ae4b1a7c1ba0dc', 'created_at': '2026-05-04T04:19:09.562235131+00:00', 'expires_at': '2026-05-11T04:19:09.562235131+00:00', 'id': '8405b06a-fbff-4134-8d54-40b7dd0cd28c', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-05-04T04:19:14.679992102+00:00'}, 'http_code': 200})]
settle 10s for quorum convergence
  node-1 sees content=va-29d1153bcd7e4b13a9cd42c271fc0182
  node-2 sees content=va-29d1153bcd7e4b13a9cd42c271fc0182
  node-3 sees content=va-29d1153bcd7e4b13a9cd42c271fc0182
  node-4 sees content=va-29d1153bcd7e4b13a9cd42c271fc0182