Function forge_plugin 

pub fn forge_plugin(
    source: &str,
) -> Result<(EscribaPluginSpec, CaixaArtifacts), ForgeError>

Forge a plugin caixa’s artifacts from one catalog source string.

The entry is the WHOLE source (the defescribaplugin manifest form is inert at apply time — escriba_lisp::apply_source ignores it), so nothing is lost and the source stays the single home for both the manifest and the entry def-forms.