v3; defaults to pkgx^2; pure js rewrite #103

Job	Run time
eval-bash	15s
install-pkgx (macos-latest)	5s
sudo-not-required	17s
usage-as-proxy	22s
install-pkgx (ubuntu-latest)	15s
eval-posix-sh	16s
eval-zsh	23s
linuxen (debian:buster-slim)	19s
multiple-apply-is-ok	13s
no-dirs (/usr/local)	17s
linuxen (debian:bullseye-slim)	19s
no-dirs (/usr/local/bin)	14s
sudo-required	14s
upgrades	16s
linuxen (debian:bookworm-slim)	23s
linuxen (archlinux:latest)	20s
linuxen (ubuntu:focal)	20s
linuxen (ubuntu:jammy)	26s
linuxen (ubuntu:24.04)	25s
linuxen (ubuntu:24.10)	17s
linuxen (fedora:latest)	21s
	6m 17s

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