034a3b70

Mutation redundancy: add --redundancy toggle + kill example survivors

- Make the redundant-test analysis opt-out: driver 'run' gains
  --redundancy/--no-redundancy (default on), and mutationCheck takes a
  'redundancy ? true' arg.  Turn it off for suites where losing within-set
  fail-fast on killed mutants is too costly.
- Kill the 9 ConstFnLib survivors that the UTF-8 fix unmasked: add
  exhaustive majorityOf5 / majorityOf5Wrapper tests over all 32 boolean
  inputs against an (uninstrumented) reference, so every per-element
  ConstBool/ListLit mutation is caught.

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