fix(scripts): remove stale duplicate nomarchy-update

Two scripts named nomarchy-update shipped from different derivations
(core/system/scripts + features/scripts/utils), both landing on PATH so
which one ran depended on PATH ordering. The core/system one never stripped
the install-time `?rev=` pin and rebuilt a nonexistent `#default` attr,
silently keeping installs frozen instead of following rolling main. Keep the
features/scripts/utils version (unpins, queries upstream HEAD, calls
nomarchy-sys-update) and drop the stale one. Regenerated docs/SCRIPTS.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/SCRIPTS.md

@@ -169,7 +169,7 @@ Phase B (per-batch PRs) refines those into `port-from-omarchy`,
 | `nomarchy-tui-remove` | `features/scripts/utils` | core/home/config/nomarchy-skill/SKILL.md | `kept` |  |
 | `nomarchy-tui-remove-all` | `features/scripts/utils` | core/home/config/nomarchy-skill/SKILL.md | `kept` |  |
 | `nomarchy-tz-select` | `core/system/scripts` | features/desktop/waybar/config/config.jsonc,features/scripts/utils/nomarchy-menu, +2 more | `kept` |  |
-| `nomarchy-update` | `core/system/scripts` | core/home/config/nomarchy-skill/SKILL.md,core/home/config/nomarchy/default/mako/core.ini, +5 more | `kept` |  |
+| `nomarchy-update` | `features/scripts/utils` | core/home/config/nomarchy-skill/SKILL.md,core/home/config/nomarchy/default/mako/core.ini, +5 more | `kept` |  |
 | `nomarchy-update-available` | `features/scripts/utils` | features/desktop/waybar/config/config.jsonc,features/desktop/waybar/themes/summer-day/config.jsonc, +1 more | `kept` |  |
 | `nomarchy-update-firmware` | `features/scripts/utils` | features/scripts/utils/nomarchy-menu | `kept` |  |
 | `nomarchy-update-time` | `core/system/scripts` | features/scripts/utils/nomarchy-menu | `kept` |  |