test: drop prose change-detector for terminal description

The test asserted three verbatim substrings of TERMINAL_TOOL_DESCRIPTION,
so any future rewording of the guidance would fail it without a behavior
change. The PR's change is prose-only guidance; the description text is
not a stable interface worth pinning.

tests/tools/test_terminal_tool.py

@@ -31,14 +31,6 @@ def test_terminal_schema_advertises_persistent_env_state():
     assert "once per session" in description
 
 
-def test_terminal_schema_keeps_fixed_waits_out_of_background_mode():
-    description = terminal_tool.TERMINAL_TOOL_DESCRIPTION
-
-    assert "only for commands that must keep running independently" in description
-    assert "Do not start sleep, timers, cooldowns, delays, or polling loops" in description
-    assert "run the wait as a normal foreground command" in description
-
-
 def test_printf_literal_sudo_does_not_trigger_rewrite(monkeypatch):
     monkeypatch.delenv("SUDO_PASSWORD", raising=False)
     monkeypatch.delenv("HERMES_INTERACTIVE", raising=False)