The browser test waits for each page a click opens to load, and for
Alpine.js to start on it, before reading that page; before, a read
could find an element of the page being left.
The delivery tests' drain takes what is queued without a timer. The
dispatch paths queue before they return, and the 25 ms timer could be
due by the time select looked, which then chose at random between it
and a queued task.
The test phase keeps the tests' temporary directories, and with them
their SQLite databases, on a tmpfs: waiting for the disk at each commit
was about 40% of internal/handlers' run time on a busy host.
Model: opus-5-5
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