[feat] New skill: language-ruby

[lugassawan]

Goal

A language-ruby skill encodes modern Ruby idioms so agents give idiomatic, up-to-date guidance when working in Ruby codebases.

Motivation

Ruby 3.x introduced significant language features (pattern matching, endless methods, hash shorthand, Ractor) that are absent from or outdated in generic LLM guidance. No language skill currently covers Ruby. The skill should be framework-neutral (not Rails-specific) to stay useful across contexts.

Surface

• Skill — language-*

Sketch (optional)

File: skills/language-ruby/SKILL.md

Key topics:

• Modern Ruby 3.x features: pattern matching, endless methods (def greet = "hi"), hash shorthand
• Idiomatic blocks, procs, and lambdas — and when to prefer each
• Frozen string literals (# frozen_string_literal: true)
• Comparable, Enumerable — extension over raw iteration
• Error handling: rescue scope discipline, avoid bare rescue
• Rails-adjacent conventions handled framework-neutrally (e.g., ActiveSupport::Concern pattern without requiring Rails)
• Testing idioms: RSpec vs minitest philosophy

Acceptance (optional)

• skills/language-ruby/SKILL.md exists with valid frontmatter
• scripts/validate.py passes
• Skill is framework-neutral (no hard Rails dependency in content)

[ejscott1]

I’m interested in working on this.

I’ll follow the existing language skill pattern and keep the content framework-neutral. My intended scope is to add skills/language-ruby/SKILL.md, add the required triggers.txt, and update the language/catalog references needed for validation.

Could you assign this to me before I start?