Replayable server-sent event stream for canonical execution updates.
v2.executions.stream, but
over standard SSE for CLIs, API integrators, and future chat surfaces.
X-API-KEYLast-Event-ID with the opaque stream cursor from the SSE id field (the
same value is also exposed as cursor in each event payload).v2.executions.get and v2.executions.detail remain available for snapshot
hydration and explicit detail fetches.execution.snapshotexecution.state_changedexecution.timeline_appendedexecution.progressexecution.resultexecution.error