"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 write-time refusal of a malformed value in a readonly field, judged by the same per-type shape checks a non-readonly field already gets. No authorable key, spelling, export or stored shape moves: the field schema is unchanged, the published validateRecord signature is unchanged, no stored row is read or rewritten, and which value a producer meant to write is not something a ledger entry can rewrite. The other categories are closed on facts: the package publishes (not unpublished); no ADR-0087 id covers this behaviour (not already-registered); and the change is a write-path verdict, not a declaration (not runtime-interface-only or type-surface-only).