serve: phone photos reach the model rotated by 90° (EXIF Orientation is ignored) #1229

Problem. Most phones save a portrait photo as a landscape JPEG and only set the EXIF tag Orientation (6 or 8). Vision.normalize() in serve/server.py passes JPEGs through unchanged, and strata-vision's decoder (stb_image) ignores EXIF. So the model sees the photo turned sideways. In OpenWebUI the model told me several times that my images were rotated by 90°, and it was right.

Fix. The fix is a small patch to serve/server.py, attached as strata-exif-orientation.patch. It applies to current main with git apply.

• A JPEG with an EXIF Orientation other than 1 no longer passes through. It goes the Pillow route instead: ImageOps.exif_transpose(), then PNG, as other formats already do.
• JPEGs without the tag, and PNG, BMP and GIF, are unchanged and still pass through byte for byte.
• Without Pillow, _exif_rotated() returns False, so the behaviour stays as today.

Checked.

• A 40×20 test JPEG with Orientation = 6 comes out as a 20×40 PNG.
• The same JPEG without the tag comes out byte-identical to the input.
• It runs live on my server: 2× TITAN RTX, UD-Q4_K_XL, images through OpenWebUI.

Written by my agent, tested on my machine.

strata-exif-orientation.patch