fix(telegram): stop /update from looping on every restart#37
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Two root causes produced the repeated "Update available" / "Checking for
updates..." messages on each startup:
1. notifyUpdate re-sent the "Update available" message on every restart
because there was no dedup. Now it records the latest notified version
under {dataDir}/last-notified-version and skips if we've already
notified about that version.
2. selfUpdate called process.exit(0) before grammy's long-polling loop
could confirm the /update message by advancing the Telegram offset. On
restart, Telegram re-delivered /update, triggering an infinite loop.
Now the handler calls bot.stop() first — grammy's stop() commits the
offset via getUpdates({ offset, limit: 1 }) — and only then runs
selfUpdate.
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Summary
Two bugs caused "Update available" and "Checking for updates..." / "Updating..." to repeat on every bot startup:
Test plan