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  "measurement_notes": [
    "Fresh source surface per trial; no filtered result reuse.",
    "Command clock covers Session.execute including history commit; excludes setup, GUI repaint and presentation.",
    "Undo and Redo checked outside command clock for each before/after configuration.",
    "Filter output hashing/dumps and fixture construction are outside the clock.",
    "Before and after command executables were built in separate target directories.",
    "No builds ran concurrently with timed trials."
  ]
}