fix(code_quality): Missing docstring on public function initialize in hatch_b

Gap ID: #431
Co-authored-by: Hermes Agent <hermes-agent@nousresearch.com>

Author: nickhac

hatch_build.py

@@ -11,6 +11,16 @@ class CustomBuildHook(BuildHookInterface):
     """Regenerate deterministic JQL artifacts before building a distribution."""
 
     def initialize(self, version: str, build_data: dict[str, object]) -> None:
+        """Regenerate JQL artifacts when building from a repository checkout.
+
+        Skips generation when building from an sdist, which has neither a .git
+        directory nor the private build-time inputs required by generate_jql.py.
+
+        Args:
+            version: The version string supplied by Hatch for the current build.
+            build_data: Mutable mapping that Hatch uses to collect extra build
+                metadata (e.g. additional artifacts and forced inclusion paths).
+        """
         # Generated files are checked in. Regenerate only in a repository checkout;
         # an sdist installation has neither .git nor the private build-time inputs.
         if not (Path(self.root) / ".git").exists():