Gate BR3 r1 quality (Low): PTB's SimpleUpdateProcessor already provides the
no-op initialize/shutdown the class copied, and config.extra is always a
dict, so the `(extra or {})` guard was dead. The wiring test only compared
PTB's concurrent_updates property with itself (true for any processor);
assert the PerChatUpdateProcessor type and DEFAULT_MAX_CONCURRENT_UPDATES
instead - now red when a plain SimpleUpdateProcessor(32) is wired in.
03395f9de7