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Pure-Rust JPEG XL (JXL) codec — RETIRED 2026-05-08 pending strict-isolation cleanroom workspace; current state ships round-1..3 ANS + headers + LfGlobal + GlobalModular wiring only. Rounds 7-11 + encoder rounds 1-6 retired with the libjxl-trace-reverse-engineering.md docs retirement of 2026-05-06.