fix(installer): eight fixes from an overnight bug-hunt and its reviewHEADmain

I squashed these because the per-bug reasoning lives in todo.org, which this commit carries.

Two could cost a machine. configure_initramfs_hook swapped the udev hook for systemd on a LUKS root, leaving a standalone encrypt hook under an init that never runs it. The rebuild succeeds and the installer exits clean, then the root won't unlock at the next boot. trim_firmware ran pacman -Rdd against twelve firmware packages behind a DMI gate reading product_name, where "Framework" never appears. That left it dead on the hardware it targets, and dangerous to fix the obvious way: this machine is a Framework Desktop whose Ryzen iGPU needs the amdgpu firmware. It refuses on PCI modalias evidence now.

wipedisk discarded before it checked. blkdiscard ran with -f, which disables the exclusive open, so picking the wrong disk destroyed a live filesystem and then reported that nothing had happened.

Four more are smaller. The NVIDIA preflight aborted dwm and headless installs over a driver floor they never need. zfs-replicate exited 0 after every dataset failed. Unattended installs blocked on two prompts, and the first fix for that inherited a [Y/n] default into passwordless console login. A fresh install left the dotfiles repo permanently dirty.

The review found a pattern worth more than any single fix. Helpers had thorough tests and none proved they were called. Deleting the call left five suites green, including the guard on that pacman -Rdd. CALL_SITES now pins nine caller/callee pairs.

The suite runs 341 tests at exit 0, with no new shellcheck findings. I proved every guard by deleting it and watching the intended test go red.

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