User reports macOS photo still rotated AND no `photo:` line in
banlu.jsonl — so either the delegate isn't firing at all or the
event-channel path is broken on the success branch.
Add `NSLog` at the top of `photoOutput(_:didFinishProcessingPhoto:error:)`
and on the CGImage path. NSLog lands in `flutter run` stderr +
macOS Console regardless of channel state, so even if the diag
event drops we'll see the delegate firing + the CGImage's
dimensions. Once we see them we'll know whether it's a delegate
problem or a channel problem.
e03e698caa