Remove MetaMethod and GhostMethod

[Earlopain]

RDoc has no special handling for these. MetaMethod is unreferenced, and GhostMethod was only used for tomdoc.

[Copilot]

Pull request overview

This PR removes the RDoc::MetaMethod and RDoc::GhostMethod code objects, which no longer have any special handling in RDoc (and were unreferenced aside from TomDoc parsing). The TomDoc signature parsing now creates standard RDoc::AnyMethod instances instead of RDoc::GhostMethod.

Changes:

• Replace RDoc::GhostMethod with RDoc::AnyMethod when synthesizing methods from TomDoc signatures.
• Delete the RDoc::MetaMethod and RDoc::GhostMethod class files.
• Remove related autoload entries and inline documentation references.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/rdoc/parser/ruby.rb	Uses RDoc::AnyMethod for TomDoc-derived method objects instead of GhostMethod.
lib/rdoc/code_object/meta_method.rb	Removes the unused RDoc::MetaMethod subclass.
lib/rdoc/code_object/ghost_method.rb	Removes the RDoc::GhostMethod subclass previously used only for TomDoc.
lib/rdoc/code_object.rb	Updates the code object hierarchy comment to drop removed classes.
lib/rdoc.rb	Removes autoloads for the deleted code object classes.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.