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thymikeethymikee
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docs(apple-runner): record why the .presentedSurface activation arm is unreachable from macOS
The arm's #else branch activates, which reads like a background-driving defect on macOS (#3254). It cannot be one: the host never sends either of this arm's two commands to the macOS XCTest runner. `alert` answers through the macOS helper (`runAppleAlert`'s host split, pinned by alert.test.ts), and `action-button` is refused by the owner's Action Button fact (`hasAppleActionButton`, pinned for every leaf by runtime.test.ts) before dispatch. The route off iOS is reached only by the tvOS and visionOS runners. Records the audit where a reader of the axis will find it; no behavior change. Partial #3254
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‎apple/runner/AgentDeviceRunner/AgentDeviceRunnerUITests/RunnerTests+CommandDispatch.swift‎

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@@ -536,7 +536,10 @@ extension RunnerTests {
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#else
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// The platform exception, written once: `SystemSurfaceHostRegistry` registers no hosts off iOS,
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// so nothing is ever served in place there and such a command keeps the activation route this
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// axis found it on.
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// axis found it on. The macOS host never sends one of this arm's commands here: `alert` answers
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// through the macOS helper (`runAppleAlert`'s host split) and `action-button` is refused by the
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// owner's Action Button fact (`hasAppleActionButton`) before dispatch, so no macOS request can
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// be activated from this arm, and only the tvOS and visionOS runners reach it off iOS.
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return prepareActivatedTarget(command: command)
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#endif
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case .existingApp:

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