fix(assistant): review of the Do row and fileops

The canvas: a To .md ended any other way than its own Stop (the footer
Stop, a question, a drop, a daemon restart, an older daemon refusing the
command) left the card at Working forever. The footer Stop goes through
stopOp(), asking and dropping end the operation first, a disconnect ends
it, and an error while nothing else runs is taken as its outcome. Each
fileops run gets its own Process, so a stopped run's late answer is never
read as the next one's. To .md takes one PDF, as one file is written.
Compress... no longer flips back when file(1) refines a kind, long errors
are elided, and a desktop with no documents folder gets
Documents/Assistant rather than ~/Assistant.

fileops: an animated GIF to PNG or JPEG left one file per frame under
names the rename never found; the first frame is taken. JPEG flattens
transparency onto white. Zipping a folder holding the output folder read
its own growing archive without end; only regular files outside it are
added, which also skips FIFOs and dangling links. qpdf warnings no longer
fail a merge. A folder's free name keeps its dots, a lone .gz or .xz is
decompressed rather than refused, and a dotfile's archive is not hidden.
Tools die with fileops even when it is killed outright, a killed run's
leftovers are swept on the next run, a stop between fork and bookkeeping
cannot miss the child, and a late stop cannot add a second answer.
Error lines lose bsdtar's doubled prefix and its delayed-exit noise.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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