[BUG] Missing require 'pathname' in attachment.rb

[andyw8]

Basic checks

• I searched existing issues - this hasn't been reported
• I can reproduce this consistently
• This is a RubyLLM bug, not my application code

What's broken?

The RubyLLM::Attachment class uses Pathname but doesn't require it, causing an uninitialized constant RubyLLM::Attachment::Pathname error when creating attachments from file paths.

How to reproduce

ruby -e "require 'ruby_llm'; RubyLLM::Attachment.new('test.jpg')"

See error: uninitialized constant RubyLLM::Attachment::Pathname

Expected behavior

The Attachment class should successfully create an attachment from a file path without errors.

What actually happened

Error occurs because lib/ruby_llm/attachment.rb uses Pathname on lines 21 and 164 but is missing require 'pathname' at the top of the file.

Error message:

uninitialized constant RubyLLM::Attachment::Pathname

Environment

• Ruby version: 3.4.8
• RubyLLM version: 1.12.0
• Provider: Anthropic
• OS: macOS (Darwin 24.6.0)