b9535e09

Mutation phase: take a MutationRunSettings record, not positional args

runMutationMode took six positional arguments including two adjacent
Bools (failFast, emitRedundancy) that could be swapped with no type
error.  Replace them with a named MutationRunSettings record so each
field is set by name at the call sites (runDriver, runDiff, the test).
Pure refactor; behaviour unchanged.

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