## Description
AutoAssignment::RateLimiter#within_limit? returned true early for
inboxes without an AssignmentPolicy, bypassing fair distribution
entirely and allowing unlimited conversation assignment.
## Type of change
- [ ] Bug fix (non-breaking change which fixes an issue)
## Script
- Script to enable users with V2 assignment:
https://www.notion.so/chatwoot/Script-to-migrate-account-to-assignment-V2-30ca5f274c9280f5b8ecfd15e28eeb9c?source=copy_link
## Checklist:
- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules
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Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>