Function publish_characterization_capture 

pub fn publish_characterization_capture(
    cx: &mut Cx,
    scenario: &ScenarioSpec,
    capture: &CharacterizationCapture,
) -> Result<Ref, Error>

Validate, intern, and publish an immutable capture for scenario.

Identity is derived solely from the versioned semantic datum. Rendered cards, debug output, and host formatting never enter the datum.