rehearsal: mutation gate (never merge) - #11
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mutation gate: fail (score 99.50, break 100)Mutated 2 file(s): src/engine/index.ts, src/engine/instances.ts Undetected mutants (kill each with a test, or annotate with a reasoned
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…yker-js/TypeScript7 crash (never merge)
… survives CI resource contention (never merge)
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Task 10 rehearsal (scratch PR #11, closed without merging): concurrency 1 hit the 15-minute job timeout at a 409-line mutate set with no report produced; concurrency 4 completed the same set cleanly in 7.7 min at 27.5 mutants/min, with no coverage-correlation warnings in the log. Concurrency 4 ships via MUTATION_GATE_EXTRA_ARGS. Derived sustainable threshold (27.5 * 12 / 0.5, rounded) is 700 lines, within 2x of the existing 800 default, so thresholdLines stays unchanged. Also carries back two stryker.conf.json fixes the rehearsal found necessary for the gate to run in CI at all (not rehearsal-specific, so they belong here rather than staying scratch-only): - tsconfigFile pointed at a nonexistent path, sidestepping a crash in Stryker 9.6.1's TSConfigPreprocessor (ts.parseConfigFileTextToJson, removed from TypeScript 7's module surface per D-022) that fired on every invocation regardless of which files were mutated - bun.timeout raised to 120s so the dry run's full-suite pass (~68-90s observed in CI) survives the runner plugin's own internal process timeout, which otherwise killed it well before Stryker's own dryRunTimeoutMinutes ever applied
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Scratch PR exercising the mutation gate end to end. Close without merging.