feat(hw): #58 nomarchy-detect-hw post-install re-probe CLI

Package the installer’s pure hardware-db probe as nomarchy-detect-hw:
prints suggested hardwareProfile and system.nix snippets (or --raw
protocol lines). Does not rewrite the flake. On PATH via the distro
module; docs/HARDWARE.md §8 updated. Close #58.

Verified: V1 (build + run on AMD laptop with fingerprint/NPU/IR cam).

modules/nixos/default.nix

@@ -322,6 +322,7 @@ in
       nomarchy-theme-sync # provided by overlays.default
       nomarchy-doctor     # read-only health check (System › Doctor)
       nomarchy-control-center # TUI control center
+      nomarchy-detect-hw  # post-install hardware re-probe (HARDWARE.md §8)
 
       # Friendly wrappers for the two rebuild paths (README §3). Run as
       # your user: `nix flake update` must NOT run as root (libgit2