The attachment store already classifies its rejections, so read_image
no longer translates them into ImageInputError codes. An AttachmentError
keeps its name and code; for codes with a known remedy the tool rethrows
it with a message naming the file and the next step, and the store
error as cause. Other store failures pass through unchanged.
ImageInputError keeps only the refusals the tool makes before storing
the image: IMAGE_UNSUPPORTED_MODEL and IMAGE_UNSUPPORTED_FORMAT. The
removed codes (IMAGE_TYPE_MISMATCH, IMAGE_INVALID, IMAGE_TOO_LARGE,
IMAGE_CONVERSION_FAILED, IMAGE_STORE_FAILED) were never released.
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