Add mutation testing gate to pull request CI - #4
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A new CI job runs `kimera ci --since` against the PR's base branch, so any surviving mutant on a changed line fails the build. kimera 0.1.1 fixes the Linux boot crash (`require "english"`) and runs its children with KIMERA=1. spec_helper now skips the coverage floor under it: a partial run always trips the floor, which failed passing runs with SimpleCov's exit 2. The CI step sets KIMERA=1 itself, since 0.1.1 sets it only for --isolated children and the warm run loads spec_helper in-process. The job passes --no-fail-on-no-coverage, as .kimera.yml already chose: SimpleCov's 100% floor already fails untested lines, and kimera reports cli/flag.rb's methods as uncovered because it cannot overlay a Data.define block. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Y6Lnj5JfWu4bi6PCYQAc5s
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This PR adds a mutation testing step to the CI pipeline using kimera, which validates that code changes are adequately tested by mutating the modified lines and ensuring the test suite catches the mutations.
Key changes
mutationjob that runs only on pull requests, checking that any mutants introduced in changed lines are killed by the test suiteKIMERAenvironment variable is set, since mutation testing on partial code changes would otherwise fail the coverage requirementImplementation details
The mutation job:
fetch-depth: 0) to enable diffing against the base branchkimera ci --since origin/${{ github.base_ref }}to mutate only lines changed in the PRKIMERA=1to disable SimpleCov's coverage floor, which would be inappropriate for partial code coverage analysishttps://claude.ai/code/session_01Y6Lnj5JfWu4bi6PCYQAc5s