Function validity_enforced 

pub fn validity_enforced() -> bool

Validity enforcement knob (V8 Slice B, D1+D2).

Off by default: returns true only when WM_VALIDITY_ENFORCE=1 (exact match — anything else, including unset, stays off). While off, the validity predicate is identically true and the recall surface is byte-identical with or without validity stamps (the S8 doctrine).