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Martin Vogel
ae52db3147
All three cost real release cycles, and none is fixed by widening a budget. daemon_application_cancels_physical_job_only_after_final_session waited for the SUBSCRIBER COUNT to reach 2, then cancelled both sessions and asserted the physical job had started exactly once. The job starts asynchronously after subscription, so both cancels could land first and leave starts == 0 -- arguably the correct outcome. It now waits for the state the assertions actually require. Verified 47/47 on Windows, the only platform it ever failed. The parallel harness refused outright when the suite leader had already exited, because taskkill /T cannot walk a tree from a dead PID. But the leader can exit between the timeout decision and that call, so the harness itself lost a race: a natural exit at the wrong moment failed the whole wave. It now proves cleanup the only way still available -- nothing parented to that PID -- and its contract asserts the PROPERTY rather than the phrase "tree cleanup" it used to grep for. That string pin is what broke when the guard was reworded while behaving correctly; the contract now checks rc==2 AND that the descendant really did survive, which would also catch a guard that claims to fail closed while leaking. extract_wide_flat_file_is_linear took ONE sample per size, so the ratio carried the noise of both. On a loaded Windows VM linear code measured 51x against a 40x bound (184ms -> 9387ms). Best-of-N instead: timing noise only ever adds time, so the minimum is the cheapest good estimate of the noise-free cost. The bound is deliberately unchanged -- it sits where linear (~20x) and quadratic (~128x) are each >=2x away, so raising it would move the test toward the very signal it exists to catch. Now measures 19.1x on Windows, 21.4x on macOS. Also: the smoke's `cli` helper redirected stderr to a file and discarded it, so any of the 10 bare `VAR=$(cli ...)` assignments could kill the run under `set -euo pipefail` printing NOTHING. One such abort cost a full Windows cycle just to locate and still could not be attributed. It now surfaces the command and its stderr. Neutral wording on purpose: one call site expects a non-zero exit and must not read as a failure. Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>