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  "harness_sha256": "6edd24f288edc3b4d16588895d7c6af9be8055df136739a03f2833deaa866d92",
  "fixture": "100 KiB plaintext file + simple local HTML page + idle Python terminal command; editor foreground; no third-party extensions",
  "sampling": "Median of five process-tree RSS snapshots, one second apart, after all three readiness oracles and 3 seconds settling",
  "limits": "Arc uses the user-prepared empty account in the existing macOS session; process, browser storage and caches retained, no app restarts. Account change is not filesystem profile isolation. VS Code and terminals use fresh profiles/configs. Follow-up batch, not paired with the earlier NUS/Zen runs. RSS sums unique descendant PIDs, double-counts shared pages; not physical footprint. Editor foreground, three windows. Small readiness extension and common Python helper included. Background activity uncontrolled.",
  "session_reused": true,
  "sampling_unit": "Five fresh editor/terminal trials sharing one existing Arc session"
}