v2.0.0

Breaking changes — see migration notes below before upgrading.

• Require Ruby >= 3.2; dropped support for Ruby 2.x and 3.0/3.1
• Pin Thor dependency to ~> 1.0; Thor 0.x is no longer supported
• .homesickrc files must now use the Homesick::RC::Context DSL instead
  of being evaluated in the CLI scope. Replace any direct CLI method calls
  with the two DSL methods: castle_path (returns the castle's path) and
  run (executes a shell command). See README for examples.
• git clone now respects the --pretend flag consistently with other actions
• Switch CI from Travis CI to GitHub Actions; added mutation testing, dependency
  auditing, and automated gem release via RubyGems trusted publishing

Migration from 1.x

If your .homesickrc calls methods directly on the Homesick CLI object, update
it to use the new DSL. For example:

# Before (1.x)
FileUtils.ln_s "#{self.class.source_root}/file", "#{ENV['HOME']}/file"

# After (2.0)
run "ln -s #{castle_path}/file #{ENV['HOME']}/file"