A new terminal's greeting `ls` goes at its shell's first prompt or never

The greeting waited for any moment the cursor sat at a prompt's input, so
where the first prompt was missed (a resize still pending, a line written
before it), `ls` was typed later into whatever ran then. It is now sent
only while nothing has run (pardes's marks saw no command start) and
nothing is typed at the prompt; past that it is dropped, never typed late.
A prompt drawn again for a resize is still the first.

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

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