Define a posterior-SBC replication contract

Posterior SBC is deliberately callback-driven: conditioning/augmentation differs by model, and eyeprocess does not pretend that re-running ordinary prior SBC on an observed-data neighbourhood is posterior SBC.

Usage

posterior_sbc_contract(replication)

Arguments

replication

Function `(replicate, observed_data)` returning `list(truth=named_numeric, draws=matrix_or_data_frame)`. The callback is responsible for the conditional posterior-SBC construction appropriate to the model, including fitting to the observed data and the required self-consistency experiment.