* fix(telegram): prevent polling watchdog from aborting in-flight message delivery
The polling-stall watchdog only tracked getUpdates timestamps to detect
network stalls. When the agent takes >90s to process a message (common
with local/large models), getUpdates naturally pauses, and the watchdog
misidentifies this as a stall. It then calls fetchAbortController.abort(),
which cancels all in-flight Telegram API requests — including the
sendMessage call delivering the agent's reply. The message is silently
lost with no retry.
Track a separate lastApiActivityAt timestamp that is updated whenever
any Telegram API call (sendMessage, sendChatAction, etc.) completes
successfully. The watchdog now only triggers when both getUpdates AND
all other API activity have been silent beyond the threshold, proving
the network is genuinely stalled rather than just busy processing.
Update existing stall test to account for the new timestamp, and add a
regression test verifying that recent sendMessage activity suppresses
the watchdog.
Fixes#56065
Related: #53374, #54708
* fix(telegram): guard watchdog against in-flight API calls
* fix(telegram): bound watchdog API liveness
* fix: track newest watchdog API activity (#56343) (thanks @openperf)
* fix: note Telegram watchdog delivery fix (#56343) (thanks @openperf)
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Co-authored-by: Ayaan Zaidi <hi@obviy.us>
