neuter-tested

Verifying a feature is real by also testing it turned off, to prove the on/off switch is honest.

Project jargon: to trust that a capability flag genuinely does something, you run the tests once with the feature disabled ('neutered') and confirm behavior actually changes when it's enabled. If disabling it makes no difference, the flag was decorative and the feature was never really there. This guards against features that are advertised but inert.