Add Chromium-only Blender WebEngine parity work

tools/web/check-dual-engine.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+native_dir="${repo_root}/build_web/native"
+mkdir -p "${native_dir}"
+
+c++ -std=c++17 -O2 \
+  -I"${repo_root}/blender-5.2.0/source/blender/web_engine" \
+  -I"${repo_root}/blender-5.2.0/extern/json/include" \
+  "${repo_root}/blender-5.2.0/source/blender/web_engine/web_engine_api.cpp" \
+  "${repo_root}/web/engine/web_engine_native_reader_stub.cpp" \
+  "${repo_root}/web/engine/web_engine_native_smoke.cpp" \
+  -o "${native_dir}/web_engine_native_smoke"
+
+"${native_dir}/web_engine_native_smoke"
+node "${repo_root}/tools/web/run-web-engine-smoke.mjs"
+printf 'dual-engine-ok\n'