The migration asked a user to close every running browser before repairing
the Copy URL shortcut, but a browser only ever rewrites its own Preferences
on exit. Waiting on all browsers deadlocks `omarchy update` for anyone whose
main browser is effectively never closed: the pending ghosts commonly sit in
a stale profile nobody has open, yet the migration blocks on the always-open
browser until the prompt is declined, failing the whole update.
A running Chromium-family browser holds a SingletonLock (and socket) inside
its user-data-dir, so whether the profile being repaired is open is
mechanical. Gate on that instead of on the sheer presence of a browser
process — the repair proceeds where the affected profile is closed, and
browsers attached to other profiles no longer hold the update hostage.
The gate stays conservative while an affected profile actually is open, and
the existing post-repair verification still catches a browser that starts
mid-repair and restores stale Preferences on exit.
The migration test now simulates an open profile with its SingletonLock
instead of a pgrep stub; every prior scenario still passes.
