- Add large data tests (1M elements) for Filter, Map, Partition, Unique
- Add concurrency stress tests with high worker counts (50-100)
- Add race condition tests with 100 iterations
- Add concurrent function call tests (10 goroutines)
- Add context cancellation tests for ParallelMap
- All tests skip in short mode to keep CI fast
All tests pass including race detector validation.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
