alice writes M1 content=v0-a4bf4a6c4be84e44a8b3006c6229f162 on node-1
  M1 id=faae9ffe-8323-4e18-8c3f-2202a3b569d1
settle 5s for initial replication
alice + bob issue concurrent PUTs (vA=va-06e8034799dd45a0b3066acbf7f02bbf from alice, vB=vb-5cebba348a6b4f6f9d5618702919c323 from bob)
  concurrent PUT results: [(0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'va-06e8034799dd45a0b3066acbf7f02bbf', 'created_at': '2026-04-23T20:02:46.359687602+00:00', 'expires_at': '2026-04-30T20:02:46.359687602+00:00', 'id': 'faae9ffe-8323-4e18-8c3f-2202a3b569d1', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-04-23T20:02:51.803520807+00:00'}, 'http_code': 200}), (0, {'body': {'access_count': 0, 'confidence': 1.0, 'content': 'vb-5cebba348a6b4f6f9d5618702919c323', 'created_at': '2026-04-23T20:02:46.359687602+00:00', 'expires_at': '2026-04-30T20:02:46.359687602+00:00', 'id': 'faae9ffe-8323-4e18-8c3f-2202a3b569d1', 'metadata': {'agent_id': 'ai:alice', 'scenario': '13'}, 'namespace': 'scenario13-contention', 'priority': 5, 'source': 'api', 'tags': [], 'tier': 'mid', 'title': 'm1', 'updated_at': '2026-04-23T20:02:51.786920108+00:00'}, 'http_code': 200})]
settle 10s for quorum convergence
  node-1 sees content=va-06e8034799dd45a0b3066acbf7f02bbf
  node-2 sees content=va-06e8034799dd45a0b3066acbf7f02bbf
  node-3 sees content=va-06e8034799dd45a0b3066acbf7f02bbf
  node-4 sees content=va-06e8034799dd45a0b3066acbf7f02bbf