v3; defaults to pkgx^2; pure js rewrite #119

Job	Run time
sudo-not-required	9s
install-pkgx (macos-latest)	4s
linuxen (debian:buster-slim)	6s
install-pkgx (ubuntu-latest)	15s
linuxen (debian:bullseye-slim)	6s
linuxen (debian:bookworm-slim)	7s
multiple-apply-is-ok	20s
linuxen (archlinux:latest)	23s
linuxen (ubuntu:focal)	7s
linuxen (ubuntu:jammy)	7s
no-dirs (/usr/local)	16s
sudo-required	15s
linuxen (ubuntu:24.04)	14s
no-dirs (/usr/local/bin)	17s
linuxen (ubuntu:24.10)	12s
linuxen (fedora:latest)	22s
upgrades	13s
usage-as-proxy	27s
	4m 0s

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