pacman/paru download progress is a multi-line terminal animation: it
repaints lines in place using ANSI cursor-movement (ESC[<n>A) and
erase-line (ESC[K) sequences, not just carriage returns. The previous
line-wise regex approaches could not reconstruct this — frames either
concatenated into one giant line (CR removed) or collapsed to blanks
(CR kept), discarding the final 100% frame.
Add scripts/clean_progress_log.py, a small dependency-free terminal
screen-buffer emulator that replays the cursor movements against an
in-memory grid and dumps the final static frame, preserving SGR color
so logs still render with color in ov/bat/less -R. It also drops the
script(1) header/footer.
Both wrappers now pipe the raw PTY capture through this cleaner (bumped
to version 5), falling back to stripping only the script(1) header when
python3 is unavailable. Document the scripts/ dir and mechanism in
AGENTS.md and docs/fish-config.md.
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