pub fn export_project(project: &Project, output_dir: &Path) -> Result<()>Expand description
Packages project into a standalone folder at output_dir: the prebuilt runtime export
template (see find_template), renamed to the project’s name, plus a res/ folder holding
the project’s assets, scripts, and scenes — the exact layout runtime’s own res_dir/
load_manifest expect. Pure file copying, no compilation — see the export/compile
implementation plan for why.