feat: implement phase 5 bun_bundle bootstrap

Co-authored-by: Eriyc <50216491+Eriyc@users.noreply.github.com>

tests/bundle_test/verify_minify.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+bundle="$1"
+minified="$2"
+
+bundle_size="$(wc -c < "${bundle}")"
+minified_size="$(wc -c < "${minified}")"
+
+if (( minified_size >= bundle_size )); then
+  echo "Expected minified bundle (${minified_size}) to be smaller than regular bundle (${bundle_size})" >&2
+  exit 1
+fi