Frozen modules were populating __origname__ with the import alias rather than the original frozen name, so importlib bootstrap logic could not resolve accurate filenames.

• Encode/decode origin names in frozen module metadata so the original name is preserved alongside the code and package flag.
• Wire import_frozen and _imp.find_frozen to expose the stored origname__ to Python, including aliases for _frozen_importlib and _frozen_importlib_external.
• Add regression coverage to ensure __origname__ reflects the correct bootstrap names.

Example:

let module = import::import_frozen(vm, "_frozen_importlib")?;
assert_eq!(
    module.get_attr("__origname__", vm)?.try_into_value::<PyStrRef>(vm)?.as_str(),
    "importlib._bootstrap"
);

• Fixes Add proper __origname__ to frozen module #4565

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.