Failing tests first. Through both image routes, 0x8192 of a 3000x600
source and 8192x0 of a 600x3000 source must answer 400 with the JSON
error body; orig, a size with both sides given and a 0 side whose
computed side stays within 8192 must be served as before, after the
refusals. In the image processor, a 0 side computed to exactly 8192 is
kept and one above is refused with ErrOutputTooLarge, which does not
exist yet.
Model: opus-5-5
