feat: vmisobuild.sh and the steam-machine-iso skill run build-calamares-modules.sh

.claude/skills/steam-machine-iso/SKILL.md

@@ -127,11 +127,15 @@ sudo rm -rf build out
 systemd-run --user --collect -q -u isobuild-$(date +%s) --working-directory=$PWD bash -c \
   "sudo podman run --rm -t --pids-limit=-1 --ulimit nofile=65536:65536 --privileged --network=host \
      -v $PWD:/iso -w /iso docker.io/cachyos/cachyos:latest bash -c \
-     'pacman-key --init && pacman-key --populate && pacman -Syu --noconfirm --needed archiso mkinitcpio-archiso git squashfs-tools grub sudo && ./build-live-modules.sh && { ./buildiso.sh -p desktop -w || ./buildiso.sh -p desktop -c -w; }' \
+     'pacman-key --init && pacman-key --populate && pacman -Syu --noconfirm --needed archiso mkinitcpio-archiso git squashfs-tools grub sudo && ./build-live-modules.sh && ./build-calamares-modules.sh && { ./buildiso.sh -p desktop -w || ./buildiso.sh -p desktop -c -w; }' \
    > $HOME/projects/iso-build.log 2>&1"
 ```
 
-`build-live-modules.sh` builds the power-off fix for the ISO's kernels
+`build-calamares-modules.sh` builds Calamares' `packagechooserq` (the Steamify
+page's module; CachyOS's package leaves it out) from CachyOS's Calamares
+source against the installed `cachyos-calamares-next`, into airootfs, with
+the version it was built for in `built-for` (the prebuilt `.so` is no longer
+committed). `build-live-modules.sh` builds the power-off fix for the ISO's kernels
 (live session; needs the source steamify-prepare.sh puts on the ISO).
 Output: `out/desktop/steamify-cachyos-*.iso` (~3.2 GB, ~10 min). The build ends with
 `chown: missing operand` + `ERROR: An unknown error`: harmless, buildiso.sh