Update slug references; mark superseded datasets as deprecated

README.md

@@ -3,6 +3,7 @@ license: cc0-1.0
 language:
 - en
 tags:
+- deprecated
 - education
 - k12
 - teks
@@ -16,9 +17,17 @@ task_categories:
 - question-answering
 size_categories:
 - n<1K
-pretty_name: CCISD TEKS Alignment Dataset (3-Way Split)
+pretty_name: '[Deprecated] CCISD TEKS Alignment Dataset (3-Way Split)'
 ---
 
+> [!WARNING]
+> **Deprecated - use [`ccisd-teks-alignment`](https://huggingface.co/datasets/robworks-software/ccisd-teks-alignment) instead.**
+>
+> This dataset is superseded: the two contain the same 428 rows with the same 12 columns; this copy only adds a train/validation/test partition, which you can reproduce in one line. Nothing here is unique to it.
+>
+> It stays online so existing references keep resolving, but it will not be updated.
+> New work should point at `robworks-software/ccisd-teks-alignment`.
+
 # CCISD TEKS Alignment (pre-split)
 
 The same 428 TEKS-to-course mappings as