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综合：影子同步+幂等下发+超时重发

未完成

示例

输入
solve()
期望输出
Shadow sync commands:
  RPI-001: new delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  RPI-002: new delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  ARD-001: new delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  ARD-002: new delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  ARD-003: new delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  GW-001: new delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
  RPI-003: new delta={'alarm_threshold': {'desired': 80.0, 'reported': 75.0}}
Retry analysis:
  CMD004: needs retry (0/3)
  CMD006: needs retry (0/3)
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