pub const KV_DOMAIN: u64 = 0x4B56_5041_4745_0001;Expand description
2026-09-25: Domain separator hashed into every KV namespace as the tag-0x02
record, so KV keys differ from SSM keys in the key material as well as by the
peer’s per-(kind, blob_bytes) arena. ASCII "KV" + "PAGE" + 1.