alice writes M1 content=v0-8dbc5dbdbe0b485cbbd57f79d296aa92 on node-1
  M1 id=5f39f8a9-6239-4366-99c5-a531bff0a55b
settle 5s for initial replication
alice + bob issue concurrent PUTs (vA=va-762f83c0ff8440c2bb8d4661d4754253 from alice, vB=vb-4acd6cc67b784c099c7818d6119ea081 from bob)
  concurrent PUT results: [(0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'va-762f83c0ff8440c2bb8d4661d4754253', 'created_at': '2026-04-23T12:18:47.957070092+00:00', 'expires_at': '2026-04-30T12:18:47.957070092+00:00', 'id': '5f39f8a9-6239-4366-99c5-a531bff0a55b', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-04-23T12:18:54.174824783+00:00'}, 'http_code': 200}), (0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'vb-4acd6cc67b784c099c7818d6119ea081', 'created_at': '2026-04-23T12:18:47.957070092+00:00', 'expires_at': '2026-04-30T12:18:47.957070092+00:00', 'id': '5f39f8a9-6239-4366-99c5-a531bff0a55b', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-04-23T12:18:54.165717940+00:00'}, 'http_code': 200})]
settle 10s for quorum convergence
  node-1 sees content=va-762f83c0ff8440c2bb8d4661d4754253
  node-2 sees content=va-762f83c0ff8440c2bb8d4661d4754253
  node-3 sees content=va-762f83c0ff8440c2bb8d4661d4754253
  node-4 sees content=va-762f83c0ff8440c2bb8d4661d4754253