v3; defaults to pkgx^2; pure js rewrite #99

Job	Run time
eval-bash	1m 15s
eval-posix-sh	53s
eval-zsh	1m 46s
install-pkgx (macos-latest)	7s
install-pkgx (ubuntu-latest)	44s
sudo-not-required	13s
usage-as-proxy	53s
linuxen (debian:buster-slim)	21s
multiple-apply-is-ok	17s
no-dirs (/usr/local)	14s
linuxen (debian:bullseye-slim)	19s
linuxen (debian:bookworm-slim)	19s
no-dirs (/usr/local/bin)	12s
upgrades	15s
sudo-required	46s
linuxen (archlinux:latest)	19s
linuxen (ubuntu:focal)	20s
linuxen (ubuntu:jammy)	24s
linuxen (ubuntu:24.04)	19s
linuxen (ubuntu:24.10)	18s
linuxen (fedora:latest)	19s
	10m 33s

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