alice writes M1 content=v0-c53caf7fa65f4712bf0c163338d92b71 on node-1
  M1 id=8e2d9f81-f6a9-40ff-b422-1c33c950e3e6
settle 5s for initial replication
alice + bob issue concurrent PUTs (vA=va-9862bc9a2a00471bb8629bdc0a82d962 from alice, vB=vb-72867fb1460a423f9aa031c919412716 from bob)
  concurrent PUT results: [(0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'va-9862bc9a2a00471bb8629bdc0a82d962', 'created_at': '2026-05-01T23:33:27.798589787+00:00', 'expires_at': '2026-05-08T23:33:27.798589787+00:00', 'id': '8e2d9f81-f6a9-40ff-b422-1c33c950e3e6', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-05-01T23:33:33.250286637+00:00'}, 'http_code': 200}), (0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'vb-72867fb1460a423f9aa031c919412716', 'created_at': '2026-05-01T23:33:27.798589787+00:00', 'expires_at': '2026-05-08T23:33:27.798589787+00:00', 'id': '8e2d9f81-f6a9-40ff-b422-1c33c950e3e6', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-05-01T23:33:33.246174148+00:00'}, 'http_code': 200})]
settle 10s for quorum convergence
  node-1 sees content=va-9862bc9a2a00471bb8629bdc0a82d962
  node-2 sees content=va-9862bc9a2a00471bb8629bdc0a82d962
  node-3 sees content=va-9862bc9a2a00471bb8629bdc0a82d962
  node-4 sees content=va-9862bc9a2a00471bb8629bdc0a82d962