fix(gating): desktop layer requires linux AND desktop|laptop role, matching README

.chezmoiignore.tmpl

@@ -17,8 +17,8 @@ AGENTS.md
 .config/nvim/.crush/**
 .config/nvim/.understand-anything/**
 
-{{ if ne .chezmoi.os "linux" }}
-# Arch desktop layer — linux only
+{{ if or (ne .chezmoi.os "linux") (and (ne .role "desktop") (ne .role "laptop")) }}
+# Arch desktop layer — linux desktop/laptop roles only
 .config/niri
 .config/niri/**
 .config/noctalia