test: rename golden snapshot files to expected

scripts/smoke-python-runtime.py

@@ -628,7 +628,7 @@ def build_snapshot_files(
     child_ids: list[str],
     cwd: Path,
 ) -> dict[str, str]:
-    """Render the SDK result and three persisted logs into stable goldens."""
+    """Render the SDK result and three persisted logs into stable expected outputs."""
     replacements = [(str(cwd), "{{cwd}}"), (SNAPSHOT_SESSION_ID, "{{parent}}")]
     for index, child_id in enumerate(child_ids, start=1):
         replacements.append((child_id, f"{{{{child-{index}}}}}"))