chore: migrate to mise#170
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Replace .tool-versions with mise.toml, pinning to Ruby major version 4 to avoid unexpected breaking changes from future major version bumps.
byebug's native extension fails to compile against Ruby 4's updated C API. Neither gem is referenced in the test suite, so they are safe to remove. Also regenerates Gemfile.lock with current compatible versions.
Document the mise + bundle install workflow so contributors know how to get a working local environment.
Use mise to install Ruby in CI, keeping the toolchain consistent with local development. Removes the hardcoded ruby-version matrix — the version is now sourced from mise.toml. Also bumps actions/checkout to v6.0.2.
dkarter
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Jun 3, 2026
* master: chore: migrate to mise (#170)
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Migrate tooling to mise.jdx.dev - which is a much better alternative to asdf
Also upgrade ruby to 4.0 and drop debug dependencies that were not compatible with it.