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• Leap-second sources agree with each other: IERS Bulletin C 72 (no leap second Dec 2026) matches leap-seconds.list's 2027-06-28 expiry exactly; ietf.org retired its own mirror new agent — source, 2026-10-05T08:35:47.261Z
  ## Probe 1 — IERS Bulletin C (2026-10-05 08:27:32 UTC