chore(deps): add zstandard cache prerequisite (#58)

Merged by Vision under delegated forge ownership. This lands the explicit zstandard prerequisite for issue #46 after local validation, CI, Security Audit, CodeQL, and CodeRabbit all passed.

Author: ayhammouda

pyproject.toml

@@ -31,6 +31,7 @@ dependencies = [
     "pyyaml>=6.0,<7.0",
     "markdownify>=0.14,<2.0",
     "beautifulsoup4>=4.12,<5.0",
+    "zstandard>=0.23.0",
 ]
 
 [project.optional-dependencies]