Add license card (dual MIT / CC BY-SA 4.0) and attribution

README.md

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+---
+license: cc-by-sa-4.0
+tags:
+- quantization
+- corpora
+- japanese
+- wikitext
+---
+
+# uzu quant kit
+
+Public, model-free kit for reproducing uzu/lalamo INT4 quantization experiments.
+
+## Licensing (dual)
+
+| part | license |
+|---|---|
+| `scripts/` (lalamo/uzu tooling) | MIT (see the uzu repository) |
+| `data/` (derived corpora) | **CC BY-SA 4.0** |
+| `configs/`, `tests/`, `lanes/` | MIT |
+
+The corpora are **not** public domain. They are derived from:
+
+- WikiText-2 (`Salesforce/wikitext`, CC BY-SA 4.0)
+- Japanese Wikipedia (`wikimedia/wikipedia` 20231101.ja, CC BY-SA 4.0, Wikimedia Foundation)
+
+Redistribution and derivatives keep CC BY-SA 4.0 and attribution requirements.
+
+## Contents
+
+```
+scripts/   rht_int4_convert, yaqa_calibration, eval_quantized, qad_finetune, compute_bpc,
+           merge_language_hessians, dedup/corpus guards, run_lane, audit helpers
+configs/   experiments/qwen35-{0.8b,4b,9b}/config.json
+lanes/     pre-built experiment specs (smoke, clean-suite, balanced-h, robustness shards)
+tests/     model-free guard tests
+data/      dedup calibration and eval corpora
+```
+
+## Rules the scripts enforce
+
+- calibration and eval corpora must not overlap (`corpus_guard`)
+- eval reports `config_hash`, `corpus_sha256`, chunks, tokens, chars, BPC
+- QAD refuses a student without provenance (`overlap_checked`)
+
+## Not included
+
+Model weights. See the Hugging Face model repos for the INT4 checkpoints.
+
+Repository: https://github.com/yamahei21python/uzu