feat(global_defaults): add system.features.rhel_repo option (iso|satellite|none)

roles/global_defaults/defaults/main.yml

@@ -83,6 +83,9 @@ system_defaults:
     banner:
       motd: false
       sudo: true
+    rhel_repo:
+      source: "iso" # iso|satellite|none — how RHEL systems get packages post-install
+      url: ""       # Satellite/custom repo URL when source=satellite
     chroot:
       tool: "arch-chroot" # arch-chroot|chroot|systemd-nspawn