fix(scripts): normalise rg paths with sed instead of --path-separator

MSYS mangles the single-byte separator argument on Windows, and the swallowed
rg error made the Input check pass vacuously.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

scripts/check_architecture.sh

@@ -107,7 +107,8 @@ if [ -d game ]; then
 	fi
 
 	input_violations="$(
-		rg -n --path-separator / '\bInput\.' game --glob '*.gd' \
+		rg -n '\bInput\.' game --glob '*.gd' \
+		| sed 's#\\#/#g' \
 		| rg -v '^game/infrastructure/input/' \
 		|| true
 	)"