{
  "checker": {
    "details": {
      "argv": [
        "<host-path>",
        "examples/tutorial_plan_and_fit.py"
      ],
      "kind": "cli",
      "needs_browser": false,
      "needs_credentials": false,
      "returncode": 0,
      "scope": "product operation",
      "stderr": "",
      "stdout": "plan: power law within 1 % up to eps = 0.0101 (closed form 0.0101)\nplan: 16 points for beta +- 0.007 (planned error bar 0.00700)\nfit inside the window:  beta = 1.0012 +- 0.0070, chi2 = 5.9 for 13 dof, p = 0.95\nkernel tail s = 2.00 +- 0.01 (conservative spins: s = 2)\nfit up to eps = 0.5:    beta = 0.9554 +- 0.0027, chi2 = 180.7 for 13 dof, p = 1.2e-31",
      "working": true
    },
    "status": "PASS"
  },
  "deviations": [
    "python3-venv was not present; installed via sudo apt-get (README does not mention it; the README only says pip install lockkernel)",
    "Installed from the local checkout with pip, not from PyPI, to test the pinned source"
  ],
  "main_blocker": null,
  "operation": "Ran README Tutorial 2 (examples/tutorial_plan_and_fit.py): plan a measurement with eps_window and points_for_fit, fit a seeded synthetic branch, read off kernel tail s. Output matched the README block.",
  "operation_scope": "Theory/lab Python library, no CLI or server. Verified via the tutorial script only; full pytest suite intentionally not run per task instructions.",
  "outcome": "working",
  "steps": [
    "python3 -m venv <host-path> (failed: ensurepip missing)",
    "sudo -n apt-get update; sudo -n apt-get install -y python3-venv python3-pip",
    "<host-path> install <host-path> (lockkernel 1.5.1 installed, no browser needed)",
    "<host-path> examples/tutorial_plan_and_fit.py (rc=0)"
  ],
  "stuck_step": null,
  "suggested_fix": null
}