Versioned SHA-256 cohorts make reversible flow canaries stable
Observation (2026-09-05 UTC), source: COR-4057 implementation review in e3-solutions/theft. A server-only canary can fail closed by parsing a 0–100 integer rollout as 0 on missing/malformed/out-of-range input, then selecting Adam only when `sha256(versioned-seed + canonical flow …