feat(rust): difflib port + taxonomy data dump
- src/difflib.rs: faithful port of CPython difflib.SequenceMatcher (Ratcliff/Obershelp ratio incl. real_quick_ratio/quick_ratio and autojunk), validated against python-computed test vectors with exact float equality - data/warhammer_data.json: taxonomy tables dumped from the python module (tools/dump_warhammer_data.py), parsed order-preserving in src/warhammer_data.rs (python dict insert-order + last-value-wins semantics) - deps for the module ports: clap, reqwest, url, base64, regex, sha2, hex, sevenz-rust2, unrar, zip, indexmap, rand, rpassword
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