docs: add S7 PLC simulator implementation plan

wanshenmean

2026-03-13 adf41ccad7f0abd082d899c390995a0a2e584044

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{
  "RoadwayCommandMapping": {
    "HC": "Formation",
    "GW": "Standard",
    "CW": "Standard"
  },
  "DefaultCommandType": "Standard"
}