"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

ADR-0087 exemption (no-migration-prescription): a refusal of a VALUE at the two engine doors: a datetime whose UTC year falls in 0001..0999, refused VALIDATION_FAILED (field code invalid_date) as a written value and INVALID_FILTER / 400 as a comparand. No authorable key, spelling, export or stored metadata shape moves: FieldSchema's datetime type, every object definition and every query shape parse as before, and @objectstack/core and @objectstack/objectql export nothing new and nothing less (isOutsideTemporalYearRange keeps its signature). A datetime already stored before year 1000 is record data, not metadata: nothing converts it, no conversion is registered, and it is never shifted; the body says how an operator finds such rows and that a write carrying one is refused, which is guidance about data, not a rewrite of any consumer's code or metadata. The other categories are closed on facts: both packages publish (not unpublished); no ADR-0087 id covers a value range and this diff adds none (not registered / already-registered); and the change is runtime behaviour, not a declaration (not runtime-interface-only / type-surface-only).