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-link

@@ -7,11 +7,10 @@
 
 set -euo pipefail
 
+# Sudo wipes HYPRLAND_INSTANCE_SIGNATURE, so the live-session refresh below
+# can't reach hyprctl. Run as user; we sudo internally for the conf write.
 if [[ $EUID -eq 0 ]]; then
-  echo "Error: run omarchy-dev-link as your user, not under sudo. The script" >&2
-  echo "       will prompt for sudo when it needs to write /etc/omarchy.conf." >&2
-  echo "       (Invoking under sudo wipes HYPRLAND_INSTANCE_SIGNATURE so the" >&2
-  echo "       live-session refresh can't reach hyprctl.)" >&2
+  echo "Error: run omarchy-dev-link as your user, not under sudo." >&2
   exit 1
 fi
 
@@ -37,7 +36,6 @@ target=$(realpath -e "$1" 2>/dev/null) || {
   exit 1
 }
 
-# Sanity: looks like an omarchy-installer checkout?
 for required in bin default shell; do
   if [[ ! -d "$target/$required" ]]; then
     echo "Warning: $target/$required not found — does this look like an omarchy-installer checkout?" >&2
@@ -47,12 +45,9 @@ done
 echo "Pointing Omarchy at $target"
 printf 'export OMARCHY_PATH="%s"\n' "$target" | sudo tee /etc/omarchy.conf >/dev/null
 
-# Update the current shell so the rest of this script and anything spawned
-# from it see the new path.
 export OMARCHY_PATH="$target"
 export PATH="$target/bin:$PATH"
 
-# Update the live Hyprland session if one is running.
 if command -v hyprctl >/dev/null 2>&1 && hyprctl version &>/dev/null; then
   hyprctl setenv OMARCHY_PATH "$target" >/dev/null
   hyprctl setenv PATH "$PATH" >/dev/null