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* fix(execution): stop a cancelled run reporting success when its wait swallows the cancellation Cancellation reaches a running execution over Redis pub/sub, which is at-most-once. The engine turns that into `status: 'cancelled'` via `signalCancelled`. But the wait handler also polled the durable Redis cancellation key itself, and on a hit it broke out of its sleep and returned an ordinary successful block output. The engine's `cancelledFlag` stayed false, so a cancelled run finished as `success: true` — and with a block after the wait, kept executing. Whichever detector fired first won. The engine's pub/sub path normally wins by about one round trip; when the wait's own 500ms poll landed inside that window the cancellation was lost. Consolidate detection in the engine, which is the only component that can project run status: extend the once-at-start durable backstop into a poll that runs for the life of the run and routes through `signalCancelled`. The wait handler and loop orchestrator now observe only `ctx.abortSignal`, which the engine aborts, so no leaf can observe a cancellation the engine has not seen. The loop orchestrator additionally used to ignore `abortSignal.aborted` whenever Redis was enabled, so a mid-loop timeout or client disconnect was invisible to it, and it awaited a Redis round trip on every iteration. Handlers that abort their own I/O off `ctx.abortSignal` are unaffected: that surfaces as a throw, which the cancelled branch of `run` already classifies. * docs(wait): correct the in-line wait ceiling to 5 minutes The Wait page claimed a 10-minute cap for a synchronous wait in three places. `MAX_INPROCESS_WAIT_MS`, the block description, the sub-block hint, and the validation error all say 5 minutes.
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