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33 CPU-only tests: FP8 block-wise/per-channel round-trips, NVFP4 round-trips (direct + reciprocal scales, native vs manual unpack agreement), scheme detection incl. ModelOpt MIXED_PRECISION, surgery guard raises, and tiny synthetic FP8/NVFP4 GPT-2 checkpoints through load_model end-to-end. Full suite: 870 passed (8 failures pre-exist on main, verified against pristine checkout). docs/theory_journal.md Appendices E-E2: engineering log of the 12 findings from implementation and real-checkpoint validation (nibble order conventions, mixed-precision layouts, the 96GB OOM and the chunked-unpack fix, transformers 5.x drift shims, Omni wrapper unwrap).