The docs: which writes fail, mark for one undo step, directory looks, the skill's log line

Round 15's doc findings: one table of which files fail a write and which
only say so; mark to make a loop's data writes one undo step; the
100-byte scratch exemption and the chord write-back in the skill; the
skill's log line with ask, answer, changed, newcol, delcol and the
restored records; a directory looked at opens a terminal that runs ls,
and why; a plain word in a terminal is listed in +Search, its rows
@p<serial>.

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

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