Default the image account to grenade

The account the image creates was fedora/fedora; make it grenade/grenade and
say in both docs that config/device.env decides it. Nothing else referenced the
name — sudo comes from wheel membership, not a per-user sudoers file.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011XgGF5wfxLDAybVnNz6eNQ

README.md

@@ -26,8 +26,9 @@ Two variants:
 | `minimal`     | 8 GiB | Console, sshd, and enough tools to debug the machine |
 | `workstation` | 16 GiB| GNOME desktop                                |
 
-Default login is `fedora` / `fedora`, and the password must be changed at first
+Default login is `grenade` / `grenade`, and the password must be changed at
-login. Root is locked.
+first login. Root is locked. Both are set in `config/device.env`
+(`DEFAULT_USER`, `DEFAULT_PASSWORD`) if you want a different account.
 
 ## Hardware status
 

config/device.env

@@ -55,5 +55,5 @@
 
 # --- default account ----------------------------------------------------
 # Password is expired at first login, so it must be changed immediately.
-: "${DEFAULT_USER:=fedora}"
+: "${DEFAULT_USER:=grenade}"
-: "${DEFAULT_PASSWORD:=fedora}"
+: "${DEFAULT_PASSWORD:=grenade}"

docs/install.md

@@ -33,7 +33,8 @@ load — the C630's UEFI does not supply one, which is the whole reason the
 
 First boot does two slow things: it relabels the filesystem for SELinux and
 grows the root partition. Several minutes on a USB stick is normal. Log in as
-`fedora` / `fedora` and set a new password when prompted.
+`grenade` / `grenade` — or whatever `DEFAULT_USER` and `DEFAULT_PASSWORD` in
+`config/device.env` were set to — and set a new password when prompted.
 
 ## Extract the Qualcomm firmware