* fix(acp): record cancelled background turns as cancelled, not succeeded
A cancelled parented ACP turn resolves without throwing (only failed turns
throw), so the turn-runner success path recorded the detached task as
succeeded. Thread the terminal status out of consumeAcpTurnStream and branch
at the runner; widen markBackgroundTaskTerminal to accept cancelled, routed
through the existing failTaskRunByRunId sink. The runTurn fallback infers
cancellation from done.stopReason, mirroring the acpx adapter.
* fix(acp): narrow cancelled task status handling
Co-authored-by: masatohoshino <g515hoshino@gmail.com>
---------
Co-authored-by: Vincent Koc <vincentkoc@ieee.org>
c0b6b846ac