refactor: update module docstrings for clarity and consistency

backend/scripts/export_openapi.py

@@ -1,3 +1,5 @@
+"""Export the backend OpenAPI schema to a versioned JSON artifact."""
+
 from __future__ import annotations
 
 import json
@@ -11,11 +13,13 @@ from app.main import app  # noqa: E402
 
 
 def main() -> None:
-    # Importing the FastAPI app does not run lifespan hooks, so this does not require a DB.
+    """Generate `openapi.json` from the FastAPI app definition."""
+    # Importing the FastAPI app does not run lifespan hooks,
+    # so this does not require a DB.
     out_path = BACKEND_ROOT / "openapi.json"
     payload = app.openapi()
     out_path.write_text(json.dumps(payload, indent=2, sort_keys=True), encoding="utf-8")
-    print(str(out_path))
+    sys.stdout.write(f"{out_path}\n")
 
 
 if __name__ == "__main__":