{
  "date": "2026-03-26",
  "default_pilot_frame": {
    "institution_count": 1,
    "cohort_count": 1,
    "primary_endpoint_family": "stress",
    "mode": "retrospective_first"
  },
  "primary_questions": [
    "Can the cohort be harmonized without breaking participant-night linkage?",
    "Does the cohort support valid nightly within-cohort interpretation for the selected endpoint family?",
    "Does the cohort improve the current transport question or only confirm within-cohort signal?"
  ],
  "minimum_fit": {
    "participants_min": 40,
    "median_nights_min": 20,
    "repeated_outcome_threshold": "30% of nights or >=3 times per week"
  },
  "preferred_fit": {
    "participants_min": 75,
    "median_nights_min": 45,
    "requires_hr_or_hrv": true,
    "prefers_raw_sidecar": true
  },
  "phases": [
    "pre_screen",
    "intake_and_harmonization",
    "feasibility_benchmark",
    "decision_gate"
  ],
  "success_criteria": [
    "clean harmonization",
    "defensible benchmark",
    "explicit subgroup review",
    "clear continuation decision"
  ],
  "stop_criteria": [
    "no stable participant-night linkage",
    "endpoint too sparse",
    "unreconstructable units or lineage",
    "quality too poor for honest interpretation"
  ]
}