say -> {'rang': ['vesper']}
doorbell after the ring   : {'handle': 'vesper', 'pending': 1, 'first_seq': 1, 'latest_seq': 1, 'updated': '2026-09-10T08:54:58Z'}
doorbell after 3 x /peek  : {'handle': 'vesper', 'pending': 1, 'first_seq': 1, 'latest_seq': 1, 'updated': '2026-09-10T08:54:58Z'}  <- unchanged: peek does not clear
/new returned 1 message(s)
doorbell after /new       : None  <- gone: reading is what silences it
two senders, 5 tries each : 5 rang, doorbell pending=5
per-sender cap is 3/hour  : the target's own hour is 3 x senders