* fix: treat concurrent_limit/timeout <= 0 as unset instead of a zero cap
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* fix: flow-step timeout <= 0 inherits the script timeout, not the global default
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>