The Windows helper tests hand step_after_wait a wait that reports when
the helper reaches it and blocks until the test has reaped the stand-in
launcher, so the old-file check no longer depends on a 500 ms sleep or a
2 s observation window. The test-only wait_watch hooks are removed. The
launcher-that-keeps-running test asks the real wait with no timeout
instead of bounding the elapsed time.
The Unix restart test puts a sleep script on the helper's PATH that
reports each pause through a named pipe, and the started command reports
whether the old process was still running. A thread that waits for the
helper to exit writes to the same pipe, so a helper that dies early fails
the test instead of hanging it.
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