v3; defaults to pkgx^2; pure js rewrite #90

Job	Run time
eval-bash	15s
eval-zsh	1m 35s
eval-posix-sh	18s
install-pkgx (macos-latest)	5s
linuxen (debian:buster-slim)	18s
multiple-apply-is-ok	14s
install-pkgx (ubuntu-latest)	15s
linuxen (debian:bullseye-slim)	20s
linuxen (debian:bookworm-slim)	21s
no-dirs (/usr/local)	14s
linuxen (archlinux:latest)	26s
no-dirs (/usr/local/bin)	16s
sudo-not-required	15s
linuxen (ubuntu:focal)	22s
linuxen (ubuntu:jammy)	19s
linuxen (ubuntu:24.04)	20s
linuxen (ubuntu:24.10)	19s
sudo-required	17s
upgrades	18s
linuxen (fedora:latest)	20s
usage-as-proxy	22s
	7m 29s

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