Add requirements-dev.txt for the test suite (#52)

- Add requirements-dev.txt for the test suite (1b063fa618b01c027d8e0b26909a54ceb943ad4c)

AGENTS.md

@@ -81,7 +81,8 @@ in five more shipped sources. Rules:
    cut. Nothing is counted just because it has a `stats.json`.
 4. Add a contract test: `src/test_<key>_contract.py` (canonical schema, non-empty
    text, positive token counts, uniform source/license, stats-file consistency).
-   Run `python3 -m pytest src/` before committing.
+   Run `python3 -m pytest src/` before committing; install the test dependencies
+   once with `pip install -r requirements-dev.txt`.
 
 ### Keep the PR to your source
 

requirements-dev.txt

@@ -0,0 +1,12 @@
+# What `python3 -m pytest src/` needs. Derived in a fresh venv by running pytest
+# until it collected and passed; pins follow the per-source src/*_requirements.txt.
+# Fetch/build scripts may need more: see their own src/<key>_requirements.txt.
+pytest>=8,<10
+pyarrow==23.0.1
+requests==2.32.5
+tiktoken==0.12.0
+beautifulsoup4==4.14.3
+langid==1.1.6
+mwparserfromhell==0.7.2
+zstandard==0.23.0
+datasketch==1.6.5