{
  "description": "cycle-day window forbid: week-1/day-1 lands on cycle day 1 (planStart=lastPeriodStart) → romanian_deadlift stripped",
  "plan": {
    "version": "1.7.0",
    "plan": {
      "phases": [
        {
          "weeks": [
            {
              "order": 1,
              "days": [
                {
                  "day_of_week": 1,
                  "blocks": [
                    {
                      "type": "main",
                      "activities": [
                        { "type": "exercise", "exercise_ref": "romanian_deadlift" }
                      ]
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  },
  "context": {
    "cycle": {
      "last_period_start": "2026-01-05",
      "length_days": 28,
      "flow_days": 3,
      "pattern": "regular"
    }
  },
  "rules": [
    {
      "id": "forbid_rdl_flow_window",
      "condition": { "field": "cycle_day", "op": "in", "value": [1, 2, 3] },
      "actions": [{ "type": "forbid_exercise", "exercise": "romanian_deadlift" }]
    }
  ],
  "options": { "planStartDate": "2026-01-05" },
  "expect": {
    "stripped_exercises": ["romanian_deadlift"],
    "surviving_refs": [],
    "diagnostic_codes": []
  }
}