Both functions are DB-free public API additions to assembly_recipes.py.
get_role_candidates() scores pantry candidates against a wizard step using
element-profile overlap with prior picks; build_from_selection() builds a
RecipeSuggestion from explicit role overrides with required-role validation.
Extends AssemblyTemplate dataclass with slug, icon, descriptor, and
role_hints fields. Updates all 13 template instantiations with
appropriate values. Adds _TEMPLATE_BY_SLUG lookup dict and
get_templates_for_api() serialiser for the templates endpoint.
