BET 0.6.0

• Added reusable asymptotic calibration for bivariate independence with continuous margins, based on the joint Gaussian limit of full-sample and internally reranked subsample interaction vectors.
• Added BEAST.asymptotic.calibrate() and BEAST.asymptotic(), with saved calibration objects and explicit compatibility checks.
• Preserved existing BET 0.5.4 full-basis BEAST behavior and native scientific implementation.
• Added lightweight regression tests and corrected documentation and source-package compiler metadata.