Per Apple's AVCaptureSession.h docs (line 1106), AVCapturePhotoOutput
applies connection rotation via EXIF tags rather than physical pixel
rotation. The macOS variants of `fileDataRepresentationWithCustomizer`
and `fileDataRepresentationWithReplacementMetadata` are
API_UNAVAILABLE(macos), so we can't replace the embedded EXIF
through the standard customizer.
Workaround: on macOS, grab the raw `AVCapturePhoto.cgImageRepresentation()`
— Apple documents this as "the physical rotation of the CGImageRef
matches that of the main image. Exif orientation has not been
applied." — and re-encode the JPEG via `CGImageDestination` with no
orientation metadata. Resulting JPEG has sensor-native landscape
pixels and no EXIF Orientation tag; viewers and Flutter's image
codec both display as landscape.
iOS path unchanged (still uses fileDataRepresentation).
Diagnostic now fires on both the success and failure branches of
the delegate, so when the capture fails (e.g. the macOS
"OSStatus error 13" the user observed) the failure reason — domain,
code, localized description — is captured to banlu.jsonl instead
of silently dropped.
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