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.

bin/omarchy-dev-unlink

@@ -6,8 +6,7 @@
 set -euo pipefail
 
 if [[ $EUID -eq 0 ]]; then
-  echo "Error: run omarchy-dev-unlink as your user, not under sudo. The script" >&2
-  echo "       will prompt for sudo when it needs to remove /etc/omarchy.conf." >&2
+  echo "Error: run omarchy-dev-unlink as your user, not under sudo." >&2
   exit 1
 fi
 
@@ -30,13 +29,11 @@ fi
 sudo rm -f /etc/omarchy.conf
 echo "Removed /etc/omarchy.conf"
 
-# Update the current shell.
 export OMARCHY_PATH=/usr/share/omarchy
-# Drop the prepended checkout bin/ from PATH if present.
+# Drop the checkout bin/ that dev-link prepended.
 PATH=$(printf '%s' "$PATH" | tr ':' '\n' | grep -vFx "$(dirname "$0")" | paste -sd:)
 export PATH
 
-# Update the live Hyprland session.
 if command -v hyprctl >/dev/null 2>&1 && hyprctl version &>/dev/null; then
   hyprctl setenv OMARCHY_PATH /usr/share/omarchy >/dev/null
   hyprctl setenv PATH "$PATH" >/dev/null