test(validation): run capture via store_result

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

test/validation/items/run/check_capture.py

@@ -0,0 +1,9 @@
+import py_func.tm as tm
+
+
+def assert_captured():
+    """The sub-run log stored by `run` via store_result must be in the gdict."""
+    log = tm.gd("captured_log", "")
+    assert "Test run success." in log, \
+        "captured sub-run log not reachable from the gdict (store_result)"
+    return 0