feat(cli): nomarchy-pull / nomarchy-rebuild / nomarchy-home

Split lifecycle into three clear commands (user pick):
  nomarchy-pull     git pull (if checkout) + flake.lock update
  nomarchy-rebuild  system switch on current lock (snap + nvd)
  nomarchy-home     Home Manager switch

Full upgrade: pull && rebuild && home. Legacy sys-update / sys-rebuild /
home-update remain as wrappers. nixos-rebuild-snap uses NOMARCHY_PATH.

V0: flake check --no-build green.

modules/home/updates.nix

@@ -1,7 +1,7 @@
 # Update awareness (opt-in, nomarchy.updates.enable) — a passive background
 # check that surfaces a Waybar indicator + a notification when updates are
-# available, without ever changing anything (you still run sys-update /
-# home-update / flatpak update). It counts:
+# available, without ever changing anything (you still run nomarchy-pull /
+# nomarchy-rebuild / nomarchy-home / flatpak update). It counts:
 #   • flake inputs whose locked rev is behind upstream (nixpkgs, the Nomarchy
 #     input, home-manager …) — via `git ls-remote` on each branch-tracking
 #     github/git input in flake.lock; offline → skipped, never a false alarm.
@@ -83,7 +83,7 @@ let
           msg="$nix flake input(s)"
           [ "$fp" -gt 0 ] && msg="$msg · $fp Flatpak(s)"
           ${pkgs.libnotify}/bin/notify-send -a Nomarchy "Updates available" \
-            "$msg — click the bar icon, or run sys-update."
+            "$msg — click the bar icon, or: nomarchy-pull && nomarchy-rebuild && nomarchy-home"
         fi
         refresh_bar ;;
       status)
@@ -91,7 +91,7 @@ let
         [ "$total" -gt 0 ] 2>/dev/null || exit 0          # up to date / unchecked → hide
         nix=$("$JQ" -r '.nix // 0' "$state"); fp=$("$JQ" -r '.flatpak // 0' "$state")
         tip="Updates available"
-        [ "$nix" -gt 0 ] && tip="$tip\n• $nix flake input(s) — sys-update"
+        [ "$nix" -gt 0 ] && tip="$tip\n• $nix flake input(s) — nomarchy-pull && nomarchy-rebuild && nomarchy-home"
         [ "$fp" -gt 0 ] && tip="$tip\n• $fp Flatpak(s) — flatpak update"
         printf '{"text":"󰚰 %d","tooltip":"%s","class":"available"}\n' "$total" "$tip" ;;
       upgrade)
@@ -99,9 +99,13 @@ let
         nix=$("$JQ" -r '.nix // 0' "$state" 2>/dev/null || echo 0)
         fp=$("$JQ" -r '.flatpak // 0' "$state" 2>/dev/null || echo 0)
         echo "Pending: $nix flake input(s), $fp Flatpak(s)."
-        if [ "$nix" -gt 0 ] && command -v sys-update >/dev/null 2>&1; then
-          read -rp "Run sys-update (flake update + system rebuild)? [y/N] " a
-          [ "$a" = y ] && sys-update
+        if [ "$nix" -gt 0 ] && command -v nomarchy-pull >/dev/null 2>&1; then
+          read -rp "Run nomarchy-pull && nomarchy-rebuild && nomarchy-home? [y/N] " a
+          if [ "$a" = y ]; then
+            nomarchy-pull
+            nomarchy-rebuild
+            command -v nomarchy-home >/dev/null 2>&1 && nomarchy-home
+          fi
         fi
         if [ "$fp" -gt 0 ] && command -v flatpak >/dev/null 2>&1; then
           read -rp "Run flatpak update? [y/N] " a