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bmh129
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`OcrJob::steps` splits `run` where the engine reads: `OcrSteps::next_page` renders the page, crops it to the region and preprocesses it, an engine reads `OcrShot::image`, and `OcrShot::place` maps the words back through the preprocessing and the crop. `run` is the same loop with `OcrShot::read`, so desktop results don't change. With only one engine, every strategy is that engine's reading, which is what the web build's workers return. `FileJob` splits `recognize_file` the same way (open, read, finish), keeping the skip-files probe on opening. `ocr::install` puts a recogniser loaded from downloaded bytes in the engine cache, so `recognizers`, `available`, `engine_unavailable_reason` and `engines_status` see it.