By: Tom Sydney Kerckhove <syd@cs-syd.eu>
Log per-test coverage progress and skip empty coverage runs Adds typed CoverageProgressEvent rendered to [[Chunk]] (matching the existing MutationProgressEvent pattern) covering: - per-test running/done events emitted to stderr from runCoverageMode - skip events when the manifest has no records or the spec has no tests Also throws an explicit nix-side error when mutationCheck is called with no test suites, and bumps opt-env-conf to pull in the many/some exponential-time fix.