Mints epoch session ids, sess:<scope>:<nonce>-<n>, counting epochs per scope. The nonce —
the uuid tail of a fresh id, which keeps it injectable and deterministic in tests — brands
every id this process instance mints, so a restarted process can never reuse a session id an
earlier process already settled (the settle-once collision, resurrected across restarts).
Mints epoch session ids,
sess:<scope>:<nonce>-<n>, counting epochs per scope. The nonce — the uuid tail of a fresh id, which keeps it injectable and deterministic in tests — brands every id this process instance mints, so a restarted process can never reuse a session id an earlier process already settled (the settle-once collision, resurrected across restarts).