test(bot): add regression test for init retry behavior

[Dhereal1]

Context

Previously, a failed bot.init() would cache a rejected promise, causing the bot to stop processing updates permanently.

Test

• Simulates init() failing once and succeeding on retry
• Verifies first call fails and second succeeds
• Asserts init() is called twice (no cached rejection)

Result

• Prevents regression of “dead bot after init failure”
• Ensures retry logic remains intact

[staindart]

If you write a test, please write it in one commit with the behaviour it tests. This fix is already pulled in PR #85 as well with the test that causes an overlap.