v3; defaults to pkgx^2; pure js rewrite #107

Job	Run time
eval-zsh	21s
eval-posix-sh	12s
eval-bash	12s
install-pkgx (macos-latest)	5s
sudo-not-required	14s
sudo-required	14s
usage-as-proxy	26s
install-pkgx (ubuntu-latest)	15s
linuxen (debian:buster-slim)	19s
multiple-apply-is-ok	13s
linuxen (debian:bullseye-slim)	21s
no-dirs (/usr/local)	22s
linuxen (debian:bookworm-slim)	22s
no-dirs (/usr/local/bin)	16s
linuxen (archlinux:latest)	26s
upgrades	14s
linuxen (ubuntu:focal)	18s
linuxen (ubuntu:jammy)	21s
linuxen (ubuntu:24.04)	25s
linuxen (ubuntu:24.10)	23s
linuxen (fedora:latest)	1m 2s
	7m 1s

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