09 Readiness V8

Verdict READINESS_FALSE_GREEN_RISK. Currently BLOCKED and writer consumes it. But gate set is fixed VALUES; it does not consume no-bypass v3; consumes false-passing guards; bool_and ignores NULL so incomplete guard values can disappear; signoff/fingerprint makes legitimate green impossible; Directus owns and can replace readiness/writer. Live PG semantics: bool_and(TRUE,NULL)=TRUE and bool_and(empty)=NULL.