Phase 1 W5 — manual Safari terminal-chunk run

Lane W5-safari-manual. Resolves whether WebKit's zero-arrival unload result in the automated rig is real or a Playwright teardown artifact.

Run ID (this session's UUIDv7)
generating…
What to do
  1. Confirm the six rows below all say armed (page finished loading).
  2. Do one of the following, then come back to this page or open a fresh tab:
    • Navigate away — type a different URL or tap a bookmark.
    • Close the tab (or close the whole browser).
    • Background the app (iOS: press the Home button / swipe up, or switch to another app) — this is the case visibilitychange exists to catch.
  3. On any machine with Node, run:
    node tools/phase1-terminal-chunk/verify.mjs --run …
  4. Repeat once per browser/device worth checking — Safari desktop and iOS Safari at minimum — using a fresh page load (fresh run id) each time.
Armed mechanisms
EventMechanismStatus