B1-B3 Slow-Layer Axiom Restatements

Canonical definition

B1 (Scalar-Only Delivery), B2 (Evidence Construction), and B3 (Bayesian Updating Under Source Opacity) are three axiom restatements for the slow Bayesian layer, drawn from Axioms 2, 3, 4, and 8, and introduced in Appendix A.5.6 to specify the slow-layer side of the fast-to-slow coupling. B1 states that the only quantity the Thinker receives from the Decision Hub for a focal Object at time $t$ is the Scalar $Vt$, with the source decomposition $(At, It, Mt)$ inaccessible by the Data Processing Inequality. B2 states that the Thinker converts $Vt$ into an Evidence proposition $Et$ by selecting the highest-posterior Hypothesis in the representable Hypothesis Space as the cause of the felt valuation. B3 states that the Belief Register updates on $Vt$ by the canonical Bayesian rule and emits $Et$, regardless of whether $Et$ is an accurate decomposition of $Vt$.