fix: resolve remaining 4 CI test failures (#9543)

- test_auth_commands: suppress _seed_from_singletons auto-seeding that
  adds extra credentials from CI env (same pattern as nearby tests)
- test_interrupt: clear stale _interrupted_threads set to prevent
  thread ident reuse from prior tests in same xdist worker
- test_code_execution: add watch_patterns to _BLOCKED_TERMINAL_PARAMS
  to match production _TERMINAL_BLOCKED_PARAMS

tests/tools/test_interrupt.py

@@ -29,8 +29,11 @@ class TestInterruptModule:
 
     def test_thread_safety(self):
         """Set from one thread targeting another thread's ident."""
-        from tools.interrupt import set_interrupt, is_interrupted
+        from tools.interrupt import set_interrupt, is_interrupted, _interrupted_threads, _lock
         set_interrupt(False)
+        # Clear any stale thread idents left by prior tests in this worker.
+        with _lock:
+            _interrupted_threads.clear()
 
         seen = {"value": False}