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db4a39b024
Three review findings on the engine's child seam, one mechanism each: - Cancellation now bridges to run.cancel() on every in-flight child, not just the shared request signal — the subagent seam leaves a provider free to honor either channel, so the consumer drives both (listener removed in the child finally). - A child result REJECTION (an infrastructure fault the seam allows) now emits the paired workflow/agent-end before propagating, and propagates as a fatal WorkflowError with the new AGENT_RESULT code — previously it skipped agent-end (permanently open child for seq-matching observers) and dissolved to a per-item null inside parallel()/pipeline(), letting a broken provider read as an ordinary failed child. A rejection landing after cancel stays a cancellation (cancelled outcome + CANCELLED). - Every hook now guards its entry with a shared throwIfCancelled(): phase()/log() no longer emit observer events after a script caught an earlier cancelled rejection, and parallel()/pipeline() refuse entry — cancellation is the next HOOK boundary, not just the next agent().