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).

docs/HARDWARE.md

@@ -296,15 +296,15 @@ exist in a named nixos-hardware module.
 
 See [MIGRATION.md](MIGRATION.md): reuse `hardware-configuration.nix`, set
 `hardwareProfile`, uncomment `nomarchy.hardware` / power in `system.nix`.
-There is **no** post-install re-probe helper yet (queued as
-`nomarchy-detect-hw`).
+Post-install re-probe (**shipped #58**):
 
-### Re-detect sketch (future)
+```sh
+nomarchy-detect-hw        # human report + suggested snippets
+nomarchy-detect-hw --raw  # MODULE / NOMARCHY / DETAIL protocol lines
+```
 
-The installer’s `nomarchy_detect_hw` is already a pure probe (stdout
-lines only). Exposing it as a package on PATH that prints suggested
-`hardwareProfile` + `system.nix` snippets would close the template gap
-without reinstalling.
+Prints suggested `hardwareProfile` and `system.nix` lines; **does not**
+rewrite the flake. Paste after review, then `sudo nixos-rebuild switch`.
 
 ## 9. Adding your model to the distro