Adopt scripts-to-rule-them-all: script/ entrypoints, Makefile shims

script/test

@@ -0,0 +1,25 @@
+#!/bin/sh
+# script/test: run the test suite. Uses `timeout` (GNU coreutils) when
+# available so the run is hard-capped at 30s; on macOS without
+# coreutils the cap is skipped.
+set -eu
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
+
+rerun_verbose() {
+    echo "--- Rerunning with verbose for details ---"
+    yarn run vitest run --reporter=verbose
+    exit 1
+}
+
+main() {
+    cd "$ROOT"
+    TIMEOUT="$(command -v timeout 2>/dev/null || command -v gtimeout 2>/dev/null || true)"
+    if [ -n "$TIMEOUT" ]; then
+        "$TIMEOUT" 30s yarn run vitest run --reporter=dot || rerun_verbose
+    else
+        yarn run vitest run --reporter=dot || rerun_verbose
+    fi
+}
+
+main "$@"