By: Tom Sydney Kerckhove <syd@cs-syd.eu>
Run mutations inside Cabal checkPhase so test resources are available Previously compileMutationReport ran the test binary in a separate derivation, requiring testResourcesDir to be passed explicitly for packages with golden test files. Now the mutations run inside the test package's own Cabal build (checkPhase), where Cabal has already set up the working directory with test_resources/ present. The report is written to a separate 'report' output via overrideAttrs. This eliminates testResourcesDir and the compileMutationReport derivation from mutation-checks.nix.