fix: make polling startup cancellation-safe

[roshnicdave]

Fixes cancellation races between start, stop, and shared bot initialization

-Scope polling controllers and stop confirmation to each run
-Cancel pending setup/retry work and ignore stale polling results after a restart

• Preserve setup failures and shared initialization behavior for concurrent callers

[codecov]

Codecov Report

❌ Patch coverage is 92.65537% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.69%. Comparing base (b04bfee) to head (a4eb241).
⚠️ Report is 142 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bot.ts	92.65%	9 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #959      +/-   ##
==========================================
- Coverage   45.52%   42.69%   -2.84%     
==========================================
  Files          19       19              
  Lines        5520     7383    +1863     
  Branches      360      497     +137     
==========================================
+ Hits         2513     3152     +639     
- Misses       3003     4146    +1143     
- Partials        4       85      +81     

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[KnightNiwrem]

How is this test meaningfully different from the test immediately above it?

If the previous test has established that retry occurs - even in the absence of parameters.retry_after for HTTP 429 - what will we be trying to establish with this test with a parameters.retry_after value of 0?

[roshnicdave]

sorry, forgot to look over tests! can you review again 🙏

[KnorpelSenf]

I have no idea which issue you ran into with your bot, and this seems to be just a slop contribution. I don't see why I should spend my free time on a review if you don't spend yours on the quality of your contributions. Closing.

Feel free to join the chat and convince us otherwise if you actually care about this.