fix(controller): remove 'persona_manager' from _LAZY_MANAGER_DEFAULTS

src/app_controller.py

@@ -1261,12 +1261,12 @@ class AppController:
   # Manager attributes that are initialized by init_state() but are absent
   # on a bare AppController() (which some tests construct). Return None
   # for these so test code that references them without calling init_state
-  # does not crash. hasattr() still returns False for non-mocked access
-  # paths because callers wrap in try/except for AttributeError when they
-  # need to distinguish "lazy" from "absent".
+  # does not crash. NOTE: callers that need to distinguish "lazy" from
+  # "absent" must use try/except AttributeError explicitly; hasattr()
+  # returns True because __getattr__ returns None (a valid attribute
+  # value).
   _LAZY_MANAGER_DEFAULTS = {
    "context_preset_manager",
-    "persona_manager",
     "tool_preset_manager",
     "preset_manager",
     "vendor_state",