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-status

@@ -4,7 +4,6 @@
 # omarchy:group=dev
 
 if [[ -f /etc/omarchy.conf ]]; then
-  # Source in a subshell so we don't mutate the caller's env.
   configured=$(
     OMARCHY_PATH=
     # shellcheck disable=SC1091