@zthr/twins

Calibrated stand-ins for services outside the factory: text messaging (with STOP and START), calendar feeds, and the shape every twin follows, so journeys can cover a whole activity even where it crosses systems we do not own. A twin records when it was last calibrated against the real thing; a stale twin is reported.

Use it for

Behavioral clones of services you do not own, fitted to recorded probes, with a calibration check that fails the twin when the real service changes.

Not for

Services you own: test those where they live.

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