MEASURED delivery times per rail and corridor

Quotes used to advertise a constant duration — the same number for an instant float payout and a Stellar burn waiting on Circle attestation. An agent planning a workflow needs to know whether value lands in fifteen seconds or twenty-five minutes; one marketing number is worse than useless because it is confidently wrong for most corridors. This publishes what settlements ACTUALLY took, per corridor. HONESTY RULE: below the sample threshold it returns insufficient-data and hands back the static estimate LABELLED as an estimate (basis: "estimate" vs basis: "measured"). It never invents a percentile from three observations.