cupsadmin: CLI, CupsKit, app in progress

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

test.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+# Runs CupsKit tests with Swift Testing from the Command Line Tools (no Xcode).
+# The CLT ship Testing.framework outside the default search path and an empty _Testing_Foundation
+# overlay, so point at the framework, disable cross-import overlays, and load the @Test macro plugin.
+# Live apply tests: CUPSKIT_LIVE_QUEUE=<throwaway Ricoh queue> ./test.sh
+START_EPOCH=$(date +%s)
+echo "started $(date +%H:%M:%S)"
+finish() {
+    local rc=$?
+    [ $rc -eq 0 ] && echo "OK: tests passed" || echo "ERROR: swift test exited $rc"
+    echo "finished $(date +%H:%M:%S) (total $(awk -v s="$(( $(date +%s) - START_EPOCH ))" 'BEGIN{printf "%.1f", s/60}') min)"
+}
+trap finish EXIT
+cd "$(dirname "$0")"
+F=/Library/Developer/CommandLineTools/Library/Developer/Frameworks
+P=/Library/Developer/CommandLineTools/usr/lib/swift/host/plugins/testing
+swift test \
+    -Xswiftc -F -Xswiftc "$F" -Xswiftc -Xfrontend -Xswiftc -disable-cross-import-overlays \
+    -Xswiftc -plugin-path -Xswiftc "$P" \
+    -Xlinker -F -Xlinker "$F" -Xlinker -rpath -Xlinker "$F" "$@"