Gate BR3 r1 reuse (Low): build_update_processor hand-rolled the int-or-
default parse that gateway.platforms._shared.coerce_port already does.
Neither caught OverflowError, so `max_concurrent_updates: .inf` in YAML
aborted connect(). coerce_port now treats non-finite values as unparseable
(as gateway.config._coerce_num already does), which also hardens its other
port/int callers; the telegram setting warns and falls back to 32.
c03cca2763