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The FanOutStep class docstring stated that fan-out execution is "currently sequential" and that `max_concurrency` is "accepted but not enforced". That has been inaccurate since #3224, which added a bounded thread-pool concurrency path to `WorkflowEngine._run_fan_out` that honors `max_concurrency > 1`. Update the docstring to match the engine's own `_run_fan_out` docstring: `max_concurrency <= 1` (the default) runs items sequentially, while `> 1` runs up to that many items concurrently on a bounded thread pool. Docstring-only; no behavior change. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>