python: document intentional ExceptionGroup swallow in sessions.list e2e

CodeQL flagged the new `except ExceptionGroup: pass` in the sessions.list
teardown as an empty except clause with no explanation. Add the same
explanatory comment the four other identical teardowns in this file already
carry.

Also wrap the enqueue `session.send(...)` call, which was 104 characters and
failed the repo's 100-column ruff lint.

Author: examon

python/e2e/test_rpc_server_e2e.py

@@ -304,7 +304,9 @@ async def test_should_list_find_and_inspect_persisted_session_state(
                 on_permission_request=PermissionHandler.approve_all,
             )
 
-            await session.send("Record a turn for sessions.list discriminator coverage", mode="enqueue")
+            await session.send(
+                "Record a turn for sessions.list discriminator coverage", mode="enqueue"
+            )
             await asyncio.sleep(0.2)
             save = await client.rpc.sessions.save(SessionsSaveRequest(session_id=session_id))
             assert save is not None
@@ -358,6 +360,9 @@ async def test_should_list_find_and_inspect_persisted_session_state(
             try:
                 await client.stop()
             except ExceptionGroup:
+                # Intentional: shutting down the per-test client can race the
+                # CLI's own teardown and surface as an aggregated cancellation
+                # error from anyio. We don't want it to fail the test.
                 pass
 
     async def test_should_enrich_basic_session_metadata(self, ctx: E2ETestContext):