Implement playable Mac client and rendering validation

script/package_render_test.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# A JSON PASS is insufficient: shutdown happens after the report is written.
+# Keep the exported client's complete log and fail on renderer/RID leaks too.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+app_path="${MT_RENDER_APP:-$PWD/build/export/mtgodot-poc.app}"
+output_dir="${MT_RENDER_OUTPUT:-$PWD/build/rendering/package-gate-$(date +%Y%m%d-%H%M%S)-$$}"
+test -x "$app_path/Contents/MacOS/mtgodot-poc"
+mkdir -p "$output_dir"
+status=0
+env -u MT_ASSETS MT_TEST_MODE=render MT_RENDER_OUTPUT="$output_dir" \
+  "$app_path/Contents/MacOS/mtgodot-poc" --quit-after 1800 >"$output_dir/client.log" 2>&1 || status=$?
+if [ "$status" -ne 0 ] || ! rg -q '^PKGRENDER: PASS$' "$output_dir/client.log" || \
+   rg -q 'SCRIPT ERROR|^ERROR:|leaked at exit|shaders of type .* were never freed' "$output_dir/client.log"; then
+  echo "FAIL: package load/exit gate (exit=$status): $output_dir/client.log"
+  exit 1
+fi
+echo "PASS: package load and clean exit: $output_dir/client.log"