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

version-rust/src/orchestrate.rs

@@ -0,0 +1,6 @@
+//! Orchestration: per-channel pipeline, gofile/0807 loops, subscriptions,
+//! --assume-done — Rust port of the logic in `version-python/dlp.py`.
+//!
+//! Failure policy (the core requirement): a failure in one URL must never
+//! abort the run. Catch, record in state.json, continue. Cooldown pauses
+//! are the only permitted stall.