Locate quoted text in a source with exact offsets, or classify it as normalized, elided, paraphrased

Overview

Finds each quote an agent attributes to a source text and returns where it sits: exact offsets in UTF-16, code points, UTF-8 bytes and graphemes, so the span slices back to the matched text. Tries an exact match, then a match tolerant of whitespace, curly vs straight quotes, dash types, ellipses, invisible characters and Unicode forms (NFC/NFD, ligatures), naming which normalizations were needed, then bracket-ellipsis elisions, then flags a probable paraphrase by word overlap

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