Function generate_s7_r_wrapper 

pub fn generate_s7_r_wrapper(parsed_impl: &ParsedImpl) -> String

Generates the complete R wrapper string for an S7-style class.

Produces the following R code:

• Class definition: ClassName <- S7::new_class("ClassName", ...) with a .ptr property of class_any holding the ExternalPtr, plus optional computed properties
• Constructor: inline in new_class(constructor = function(...) ...), supports .ptr shortcut parameter for factory methods returning Self
• Properties: S7::new_property(...) for each getter/setter/validator annotated with #[miniextendr(s7(getter))] etc., with support for class constraints, defaults, required, frozen, and deprecated modifiers
• Instance methods: S7::new_generic(...) + S7::method(generic, class) pairs dispatching to Rust .Call() wrappers via x@.ptr
• External generics: S7::new_external_generic("pkg", "name") for overriding generics from other packages
• Multiple dispatch: via #[miniextendr(s7(dispatch = "x,y"))]
• Fallback methods: S7::method(generic, S7::class_any) with tryCatch for safe slot access on non-S7 objects
• Static methods: regular functions named ClassName_method(...)
• Convert methods: S7::method(convert, list(From, To)) for convert_from and convert_to annotations
• S7 parent/abstract: optional parent and abstract = TRUE in class definition

Roxygen2 documentation and @importFrom S7 ... tags are generated automatically.