fix: follow-up for salvaged PRs #6293, #7387, #9091, #13131

- Fix duplicate 'timezone' import in e2e conftest
- Fix test_text_before_command_not_detected asserting send() is awaited
  when no agent is present in mock setup (text messages don't produce
  command output)

tests/e2e/test_discord_adapter.py

@@ -57,10 +57,10 @@ class TestMentionStrippedCommandDispatch:
             mentions=[bot_user],
         )
         await dispatch(discord_adapter, msg)
-        # Message is accepted (not dropped), but not dispatched as a command
-        discord_adapter.send.assert_awaited()
+        # Message is accepted (not dropped by mention gate), but since it doesn't
+        # start with / it's routed as text — no command output, and no agent in this
+        # mock setup means no send call either.
         response = get_response_text(discord_adapter)
-        # /help command output lists /new — if it went through as text, it won't
         assert response is None or "/new" not in response
 
     async def test_no_mention_in_channel_dropped(self, discord_adapter):