On Windows the time limit measures real time, so a test blocked on the lock
could be killed by 'Maximum execution time exceeded' before it even started.
The limit is lifted for the flock() wait and restored right after.

Method-level annotations only; attributes take precedence over the docblock,
which stays fully functional. File-level .phpt annotations cannot be replaced
(no file-level attributes in PHP, runner reads them statically before spawn).

- PHP escapes arguments itself
- subshell call is bypassed on Linux too