{
  "schema_version": "1.0",
  "dataset_id": "tg_foundation_comparability_2026_09_24",
  "dataset_family": "TrailGenic Foundation comparability evidence",
  "version": "0.1.0",
  "release": "2026-09-24.2",
  "as_of": "2026-09-24",
  "status": "pilot_observational_evidence",
  "canonical_url": "https://www.trailgenic.com/foundation-comparison#foundation-comparability-gate",
  "evidence_url": "https://www.trailgenic.com/foundation-comparison#response-record",
  "source_provenance": {
    "type": "selected_public_webflow_observations",
    "recorder": "Mike Ye",
    "interpreter": "Ella (AI)",
    "source_release": "2026-09-24.2",
    "source_page": "https://www.trailgenic.com/foundation-comparison",
    "private_source": "September 24 master workbook (not redistributed)",
    "verified_at": "2026-10-08"
  },
  "privacy_scope": {
    "data_granularity": "aggregate_plus_three_selected_public_sessions",
    "excluded": [
      "full private ledger",
      "raw telemetry",
      "precise personal locations",
      "clinical or causal claims"
    ]
  },
  "release_lineage": {
    "historical_mcp_baseline": {
      "as_of": "2026-09-17",
      "status": "preserved_historical_snapshot",
      "counts": {
        "walking": 25,
        "rucking": 18,
        "running": 20,
        "hiking": 40,
        "total": 103
      },
      "endpoint": "/datasets/longevity/foundation"
    },
    "newer_public_webflow_snapshot": {
      "as_of": "2026-09-24",
      "release": "2026-09-24.2",
      "status": "selected_observations_no_full_ledger_backfill",
      "counts": {
        "walking": 26,
        "rucking": 19,
        "running": 21,
        "hiking": 41,
        "total": 107
      }
    }
  },
  "screening_method": {
    "purpose": "Screen eligibility for a matched three-way Foundation contrast; descriptive only.",
    "operational_distance_band_mi": {
      "min": 3.15,
      "max": 3.25,
      "qualification": "Pilot screening tolerance around the roughly 3.2-mile course, not a scientifically validated matching threshold."
    },
    "rules": [
      {
        "code": "feeding_state_difference",
        "logic": "Explicitly fed observations cannot be pooled into the fasted-control comparison."
      },
      {
        "code": "distance_outside_reference_band",
        "logic": "Distances outside the pilot band are flagged. Similar distance alone would not establish comparability."
      },
      {
        "code": "mixed_vs_steady_running",
        "logic": "Mixed run–walk observations are not substituted for the steady-running S10–S14 historical window."
      }
    ],
    "limitations": [
      "One-person longitudinal observations, not randomization.",
      "Different dates, training history, pace, hydration and sleep remain potential confounders.",
      "Source ready flags do not provide independently timed post-session recovery.",
      "September 24 full-ledger backfill is not part of this public dataset.",
      "No clinical readiness, efficiency ranking or causal adaptation claims."
    ]
  },
  "selected_sessions": [
    {
      "id": "walking26",
      "modality": "walking",
      "session_number": 26,
      "date": "2026-09-21",
      "feeding_state": "fed",
      "distance_mi": 3.17,
      "duration_min": 51.3,
      "avg_hr_bpm": 118,
      "corrected_hr_drift_pct": 4,
      "zone1_pct": 49,
      "sleep_score": 47,
      "perceived_effort": 1,
      "protocol_class": "foundation_walk"
    },
    {
      "id": "rucking19",
      "modality": "rucking",
      "session_number": 19,
      "date": "2026-09-24",
      "feeding_state": "fasted",
      "distance_mi": 3.86,
      "duration_min": 69.5,
      "avg_hr_bpm": 111,
      "corrected_hr_drift_pct": 3,
      "zone1_pct": 87,
      "sleep_score": 83,
      "perceived_effort": 1,
      "protocol_class": "load_ruck",
      "external_load_lb": 20
    },
    {
      "id": "running21",
      "modality": "running",
      "session_number": 21,
      "date": "2026-09-23",
      "feeding_state": "fasted",
      "distance_mi": 3.19,
      "duration_min": 38.2,
      "avg_hr_bpm": 146,
      "corrected_hr_drift_pct": 4.5,
      "zone1_pct": 1,
      "sleep_score": 80,
      "perceived_effort": 3,
      "protocol_class": "mixed_run_walk"
    }
  ],
  "assessment": {
    "screening_status": "not_comparable",
    "matched_three_way_experiment": false,
    "reason": "The latest three observations have documented protocol and dose differences that prevent a matched contrast.",
    "evaluations": [
      {
        "id": "walking26",
        "modality": "walking",
        "exceptions": [
          "feeding_state_difference"
        ]
      },
      {
        "id": "rucking19",
        "modality": "rucking",
        "exceptions": [
          "distance_outside_reference_band"
        ]
      },
      {
        "id": "running21",
        "modality": "running",
        "exceptions": [
          "mixed_vs_steady_running"
        ]
      }
    ]
  }
}