jpeg: decoder parity stack (post-#590)#1
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- Implement JpegDecoder for baseline and progressive JPEG decoding - Add accessor methods: width(), height(), num_components(), is_progressive(), metadata() - Add extract_metadata() for CXX bridge compatibility - Add 12 JPEG test files for various formats (grayscale, RGB, progressive, subsampling) - Add 11 integration tests for JPEG file parsing - Add extended types for libjpeg-turbo parity (JpegBitDepth, JpegColorSpace, IdctScale) - Fix shift overflow in JpegBitDepth::max_value()
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Stacked on libjxl#590 (base: feature/jbrd-box-support).\n\n- Adds standalone JPEG decoder + regression fixtures\n- Progressive scan handling\n- SIMD YCbCr/BGRA and IDCT parity\n- Libjpeg-turbo parity references (scaled + 12-bit)\n\nTests: cargo test -p jxl --features jpeg-reconstruction test_libjpeg_turbo_ -- --nocapture\n\nNotes:\n- Idea related to https://github.com/libjxl/jxl-rs/issues/513\n- This PR is exploratory; not yet sure whether it should be kept or killed