Trim over-commented Chunk 3+/4 work

A pass over the install scripts, dev-tools commands, and Hyprland Lua
files that I had stuffed with explain-everything preambles. Most of
those rationales (which files ship where, why hyprctl setenv doesn't
suffice, etc.) belong in commit messages or PR descriptions, not in
code people have to read forever. Kept the few comments that document
genuinely non-obvious behaviour: the keybind-env reason for hl.env in
envs.lua, why the runtime PAM seds stay scripted in
increase-lockout-limit, the chroot/--now distinction in chroot.sh, and
the dev-pkg-test split-install reason.

install/config/powerprofilesctl-rules.sh

@@ -1,8 +1,5 @@
-# The udev rule (/etc/udev/rules.d/99-omarchy-power-profile.rules) ships via
-# omarchy-settings. power-profiles-daemon.service enable lives in
-# install/config/enable-services.sh. This script just reloads udev so the
-# rule takes effect and removes the pre-rename legacy path (idempotent for
-# re-install/downgrade tests).
+# Remove the pre-rename legacy path on every run (idempotent vs the one-shot
+# migration, which only fires once per user).
 sudo rm -f /etc/udev/rules.d/99-power-profile.rules
 sudo udevadm control --reload 2>/dev/null
 sudo udevadm trigger --subsystem-match=power_supply 2>/dev/null