Add placeholder docstring column for schema consistency

- Added empty string docstring column as placeholder
- Ensures compatibility when training across all Coq/Lean4 datasets
- Real docstrings to be extracted and added in future update
- Prevents training errors from schema mismatch

README.md

@@ -1,16 +1,43 @@
 ---
 license: bsd-2-clause
 tags:
-  - theorem-proving
-  - formal-methods
-  - coq
+- theorem-proving
+- formal-methods
+- coq
 task_categories:
-  - text-generation
-  - feature-extraction
+- text-generation
+- feature-extraction
 language:
-  - en
+- en
 size_categories:
-  - n<1K
+- n<1K
+dataset_info:
+  features:
+  - name: fact
+    dtype: string
+  - name: type
+    dtype: string
+  - name: library
+    dtype: string
+  - name: imports
+    list: string
+  - name: filename
+    dtype: string
+  - name: symbolic_name
+    dtype: string
+  - name: docstring
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 347960
+    num_examples: 776
+  download_size: 94433
+  dataset_size: 347960
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
 ---
 
 # Coq-ExtLib

data/train-00000-of-00001.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:6861baa66573af3d30c8f4eaec77febfc8cfa81e95cfbedd29efb3a2830caef1
-size 94046
+oid sha256:4bc459bf70aa9e0482c4d67eac7291ab9a380574b4fd5cb4f0407c138719e9a9
+size 94433