HindsightEmbedded.close() delegates to its sync client.close(). When Hermes
created/used that client on the shared async loop, closing it from the main
thread raises 'attached to a different loop' before aiohttp releases the
session — so the ClientSession / TCPConnector leak past provider teardown.
Close the embedded inner async client on the shared loop first via
_run_sync(inner_client.aclose()), then let the wrapper's sync close()
do its daemon/UI bookkeeping.
Salvage of #14605: test placement rebased — appended TestShutdown class
after TestSharedEventLoopLifecycle (which landed on main after the PR was
written). Original author attribution preserved.
18beb69b49