A new pane with no room under the last goes last all the same

A pane from pane/new or New takes the bottom half of its column's last
pane, as acme's coladd does (cols.c:62-65); when that pane is too short
to give it a tag and 2 rows, the fallback halved the tallest pane and
put the new one under it, mid-column (the 7 9 8 found). It now goes last
all the same, with half the tallest pane's rows (its tag measured at the
column's width). Tty from a pane's ctl already follows acme's
makenewwindow (the active column first, util.c:456-467); fs.md now says
so rather than beside that pane.

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

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