- Drop the 900s "inbound liveness" INFO line from the salvage: a periodic
log heartbeat is a feature with a separate scoping call (#111211 item 3);
the existing stall watchdog already escalates when getUpdates stops.
- The polling error_callback interpolated the raw exception and left the
redaction call inside the format string, so its lines read
"Telegram network _redact_telegram_error_text(error), scheduling
reconnect: ..." and leaked unredacted text. Redact for real.
- Tests: keep two invariants (recovered wording after network errors;
clean bootstrap stays "confirmed healthy") and the transport test.
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