fix(bot): silence "Aborted delay" polling log on Ctrl+C shutdown

[konard]

Summary

When the agent is stopped (Ctrl+C), Grammy's bot.stop() aborts the polling loop's pending long-poll delay through an AbortController. The resulting rejection surfaces in DealBot.start()'s .catch(...) handler and was being logged as:

[Bot] Polling error
  err: { type: "Error", message: "Aborted delay", stack: ... at Bot.stop (...grammy/out/bot.js:341) }

This is misleading — it looks like a real failure but is just Grammy's normal shutdown signal. The annoyance was especially visible on the MTProxy path, where the shutdown sequence is slower.

This PR adds a stopping flag to DealBot that is set inside stop(). The .catch handler in start() now suppresses the log when the rejection arrives during shutdown. Real polling failures during normal operation continue to be logged.

Changes

• src/bot/index.ts: track stopping and skip the [Bot] Polling error log when the rejection arrives during a shutdown.
• src/bot/__tests__/deal-bot-shutdown.test.ts (new): regression tests covering both the suppressed-during-shutdown case and the still-logged-during-runtime case.
• CHANGELOG.md: note under [Unreleased] / Fixed.
• package.json: bump to 0.8.17.

How to reproduce (before this PR)

1. Configure mtproto.enabled: true with at least one proxy.
2. npm start, wait for [Bot] @… polling started.
3. Press Ctrl+C.
4. Observe ERROR: [Bot] Polling error … Aborted delay followed (after SHUTDOWN_TIMEOUT_MS) by Shutdown timed out, forcing exit.

After this PR, the Polling error line is gone — stopping is silent on the polling channel.

Test plan

• npm run lint — no errors
• npm run typecheck — no errors
• npm test — 3498/3498 passing, including the two new shutdown tests in src/bot/__tests__/deal-bot-shutdown.test.ts
• npm run format:check — clean
• Manual: run agent with MTProxy, Ctrl+C, confirm no [Bot] Polling error … Aborted delay line appears

Fixes #460

[konard]

Solution summary

Both CI runs passed. Summary:

Root cause: Grammy's Bot.stop() aborts the polling loop's pending long-poll delay via an AbortController. The rejection (Aborted delay) propagates through the bot.start() Promise into DealBot.start()'s .catch(...) handler at src/bot/index.ts:541, where it was logged as [Bot] Polling error — making a normal Ctrl+C look like a crash, particularly with MTProxy enabled.

Fix (commit 024d1a1):

• src/bot/index.ts: added a stopping flag set inside stop(); the .catch in start() skips the error log when it fires during shutdown.
• src/bot/__tests__/deal-bot-shutdown.test.ts: two regression tests — silent during shutdown, still logged during runtime.
• CHANGELOG.md entry under [Unreleased] / Fixed.
• package.json bumped to 0.8.17.

Verification: lint clean, typecheck clean, format clean, full suite 3498/3498 passing, both upstream CI runs green.

PR: #464 (now ready for review).

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[konard]

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[konard]

✅ Ready to merge

This pull request is now ready to be merged:

• All CI checks have passed
• No merge conflicts
• No pending changes

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