The FTS fail-open detach now waits up to the caller's write budget (20 s /
60 s) for the write lock, so the one-time quarantine check before the loop
left a long window: a sibling that quarantined the file meanwhile still got
its triggers dropped and the stale breadcrumb committed on the quarantined
handle. Re-check the handle flag and the process-wide storage latch at the
top of every attempt, via the same _raise_if_db_corrupt(storage=True) that
_execute_write runs per attempt.
Classify the retryable lock error with is_sqlite_lock_error (result code
first) instead of a locked/busy substring match, matching #120488.
82c5afb19d