On a terminal, each draw of the walk shows the path of the last file
it found on the line below, cut short before the last column with
wide characters counted as two columns. The progressbar library's
detail row draws it. Control characters in the path are written out,
as \t or \x1b, so that the terminal does not act on them. The line is
erased before a warning and when the walk ends, so the next phase is
drawn on it. Nothing changes when stderr is not a terminal.
github.com/rivo/uniseg, already in the module graph through the
progressbar library, becomes a direct dependency for the column count.
Model: opus-5-5
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