An event reader whose pane closes reads EOF, not ENOENT

A script following a pane's event in a loop ended in an error when the
pane went, though nothing had gone wrong: the pane was simply done. A
read on an event open whose pane has closed now answers no bytes, the
end a pipe's reader sees when its writer goes, so cat and while-read
end cleanly. pty/data keeps acme's answer.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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