{
  "study_id": "STUDY-000B",
  "title": "Adaptive Efficiency And Internal Cost Under Specialization",
  "created": "2026-06-09 09:18:41",
  "package_root": ".",
  "source_root": "source_tables",
  "source_manifest_file": "manifest/source_table_manifest.csv",
  "status": "flagship_companion_study_complete",
  "headline_findings": [
    "Running share of 28-day activity increased from 15.26% to 56.40%.",
    "Speed-per-heart-rate efficiency improved by 13.41%.",
    "Power-per-heart-rate efficiency improved by 2.82%, much less than speed-per-HR.",
    "Next-day resting heart rate improved by -19.16%.",
    "Mean unexplained HR burden shifted upward by 4.69 bpm, indicating persistent session-level burden."
  ]
}