## Summary
- filter PostHog telemetry exceptions for  instances emitted by 
- keep existing telemetry filtering behavior for other exception types
unchanged
- add unit coverage for filtered 429 and non-filtered non-429 rate limit
errors

## Test plan
- npm run fmt
- npm run lint:fix
- npm run ts
- npm test

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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