docs: align Ruby version requirements

[abechan1]

Motivation

• Align the documented Ruby requirement with the gemspec required_ruby_version = ">= 3.2.0" so README and contributor setup instructions do not conflict.

Description

• Update README.md to state Ruby 3.2.0 or later and update AGENTS.md setup line to Ruby 3.2.0+ so both files match slidict.gemspec.

Testing

• Attempted bundle install but it failed due to RubyGems returning 403 Forbidden while fetching remote specs, and thus bundle exec rspec and bundle exec rubocop could not be run because the rspec and rubocop executables were not available.

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Codex Task

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9f73452c-6da7-4fd2-b411-799264ee87ea

📥 Commits

Reviewing files that changed from the base of the PR and between 989334a and dedc73f.

📒 Files selected for processing (2)

• AGENTS.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/gemspecruby

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