vercel__workflow/.changeset/sealed-log-spec-seven.md

@workflow/world, @workflow/world-vercel, @workflow/world-local, @workflow/world-postgres, @workflow/core

@workflow/world	@workflow/world-vercel	@workflow/world-local	@workflow/world-postgres	@workflow/core
minor	minor	minor	minor	minor

New runs are created with the sealed-log event identity (specVersion 7). A sealed-log run's event positions are assigned by the backend before each write commits, so concurrent writers never contend for a position. A position whose writer dies is closed by the backend with a noop event; replay steps over those without delivering them or advancing the deterministic clock. Set WORKFLOW_SEALED_LOG=0 to put a deployment back on the previous scheme. Every runtime reads sealed logs either way, and a run's version is fixed at creation, so the setting only affects new runs.