[chenyan2002]

• wrapped naming in one place. The "wrapped-" / "wrapped_" strings that were copied around now live in a few small helpers in src/util.rs. codegen/mod.rs, codegen/record.rs, traits/proxy.rs and util.rs now use those helpers instead of hand-editing prefixes.
• generate_wrapped_wits split in two. It used to do two jobs. Now one function builds conversion.wit (all modes) and another builds the wrapped-* packages (Record mode only). Both are called from generate_component and hand their files back like everything else, instead of writing to disk themselves.
• No second WIT parse. They reuse the WIT that instrument.rs already parsed instead of reading the directory again.
• Less repeated code in ast.rs:
  • one helper for the recorder/debug/dialog imports (was written twice);
  • one helper to list interface names (replaces six copies of the same loop);
  • small helpers for the link lines in generate_wac;
  • load_imports and load_exports share one function for reading a component's imports.
• Clearer bookkeeping. LinkInfo and its unused fields are replaced by four plainly named maps/sets.
• Errors instead of panics. An unsupported world item or a non-component input now returns an error instead of hitting todo!() / panic!(). That's the only intended behaviour change.
• remove magic42 in get-mock- conversion function by storing the type alias in the bindgen code, and extract the last segment in the full path.