mutant-survival-triage

Turns "this mutant survived" into "here is the specific test that would kill it, and here is the input that separates the mutant from the original."

What this owns, and what it does not

Owns: one surviving mutant at a time. Reading the mutated line and the tests that already covered it, deciding which of five reasons explains the survival, and writing a concrete test proposal (inputs plus the assertion) that would flip the mutant to killed.

Does not own: installing or configuring a mutation testing tool, choosing mutate globs, picking a mutation-score threshold, or wiring a build gate. Those are per-tool configuration decisions and are settled before a report exists. This work starts at the report and ends at a test proposal a human writes.

Running the triage as an investigation