visual-cortex-ocr-onnx 0.4.0

PaddleOCR detection+recognition via ONNX Runtime for visual-cortex, with pinned, checksummed model download.
Documentation 
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#[derive(Debug, thiserror::Error)]
pub enum OcrError {
    #[error("model download failed for {url}: {reason}")]
    Download { url: String, reason: String },

    #[error("checksum mismatch for {path}: expected {expected}, got {actual}")]
    ChecksumMismatch {
        path: String,
        expected: String,
        actual: String,
    },

    #[error("model load failed: {0}")]
    ModelLoad(String),

    #[error("inference failed: {0}")]
    Inference(String),
}