feat(menu): Recovery scopes (#111), System IA (#105), drop Control Center (#110)

System is Connectivity / Devices / Recovery / Preferences under the same
six-entry root. Recovery lists desktop (HM), system boot, and BTRFS files
once each with cost labels. Control Center is gone: blur/gaps live in Look
& Feel; update checks and Bluetooth/Printing package toggles in Preferences
(with rebuilds). docs/RECOVERY paths updated.

README.md

@@ -75,7 +75,6 @@ Flat on purpose. Two module trees, one options file each, no hidden layers.
 │   ├── nomarchy-state-sync/       # state writer + rebuild dispatcher (Python)
 │   ├── nomarchy-install/          # live-ISO installer (gum + disko + mkFlake)
 │   ├── nomarchy-doctor/           # read-only health sheet, one command per failure
-│   ├── nomarchy-control-center/   # TUI settings front-end over nomarchy-state-sync (gum)
 │   └── nomarchy-battery-notify/   # low-battery toast watcher backing battery-notify.nix
 ├── templates/downstream/          # machine flake SoT (`flake init` + installer copy/patch)
 ├── docs/                          # human docs — map: docs/README.md