Why

Codegen fails when a schema contains intersection types (allOf) or lists with complex inner types (e.g. list[dict[str, Any]]). Both crash with Complex type must be put through render_type_expr! or Unexpected expression when expecting a type name: DictTypeExpr(...) because TypeName objects are used directly in f-strings or passed to ensure_literal_type which only accepts simple TypeName values.

What changed

• Fix TypeName.__str__() crash in the RiverIntersectionType encoder by wrapping encoder_name with render_literal_type(), matching the existing pattern used by RiverUnionType (line 625) and RiverConcreteType (line 654)
• Fix ensure_literal_type crash when a list's inner type is a complex expression (e.g. list[dict[str, Any]]) by guarding the ListTypeExpr match to only enter the encoding branch for TypeName inner types, falling through to list(x) for composite types that don't need encoding

Test plan

Describe what you did to test this change to a level of detail that allows your reviewer to test it