feat(build): route VM-internal pacstrap through host pacoloco

The build-host pacoloco routing from e2eb958 only covered mkarchiso's pacstrap. VMs spawned by scripts/test-install.sh ran their own pacstrap inside the guest, fetching ~600 packages per config from upstream and re-hitting the same archzfs corruption that bites the build host. A full 12-config test-install run exposed 7200+ package downloads to upstream flake.

I added a routing step to run_install() in test-install.sh, after the config file gets SCP'd to the VM and before archangel runs. It detects pacoloco on the host (port 9129, same probe as build.sh's) and rewrites the live system's /etc/pacman.conf over SSH. [core] and [extra] swap their Include lines for Server lines pointing at 10.0.2.2:9129/repo/archlinux/$repo/os/$arch. A preempt [archzfs] block lands ahead of archangel's default insertion.

10.0.2.2 is QEMU's SLIRP default gateway as seen from the guest, so the host's localhost:9129 maps to that address inside the VM. Pacoloco binds 0.0.0.0:9129, reachable from there without firewall changes.

The preempt matters because archangel's install_base checks for an existing [archzfs] block in /etc/pacman.conf and skips its own insertion when one is already there. Writing the pacoloco-routed [archzfs] up front means archangel keeps the routed version. The installed system's $MNTPOINT/etc/pacman.conf isn't touched: it gets upstream URLs like before, since the installed system shouldn't depend on the test host's proxy.

The status message uses a plain echo rather than test-install.sh's info() function. run_install() runs inside a bash -c subshell at line 864 that only exports ssh_cmd and run_install via declare -f. A bare info call there resolves to /usr/bin/info (the GNU info reader) and prints a confusing "No menu item" error. An inline comment in the code records the pitfall.

Verified end-to-end with scripts/test-install.sh single-disk: pacoloco's cache grew from 77MB (post-build) to 953MB (post-VM-install), the VM's pacstrap completed cleanly, and the install verified. Bats: still 181.

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