docs: flag condition-5-* configs as raw, pre-cleanup model output

README.md

@@ -909,6 +909,8 @@ dataset_info:
 
 > **Note (2026-05-18):** Current Phase 3 configs use the short `condition-*` namespace and include `103k`, `20k`, and `5k` sizes for Conditions 1--2. Phase 2 configs remain available under the `phase-2-the-stack-v1-*` namespace for reproducibility.
 
+> **⚠️ Note on the `condition-5-*` (model-translated) configs — raw, pre-cleanup:** The `condition-5-{ur,zh,es}-5k-c4ai-aya-expanse-32b` configs are **raw LLM translation output** and carry known prompt-leakage contamination: translator-model preamble text, ` ```json ` wrappers, and `Explanation:` / `Explicación:` / `解释:` commentary that leaked into string literals and identifier names. This affects rows that parse as valid Python as well as rows that do not. These rows are intentionally retained as-generated to support cleanup research; cleaned configs will be published separately. Treat `condition-5-*` as raw data.
+
 Multilingual Python code datasets for the **Language Decoded** project (part of [Cohere's Tiny Aya Expedition](https://aya.for.ai)), investigating whether code's reasoning benefit for language models is **language-dependent** or **structure-dependent**.
 
 ## Research Question