mailrs-attachment-extract 1.0.0

Extract text from email attachments (PDF + image OCR). PDF text via `pdf-extract` (pure Rust); OCR via the `tesseract` CLI subprocess (not linked as a C library). Two-stage fallback for scanned PDFs: try embedded text first, fall back to OCR on the raw bytes if the text is too short. Returns `ExtractionResult` with text + language + confidence + page count + JSON metadata.