perf: async hooks claude code check possibilities and optimizations

[sagarsrc]

Scope

backend

What's slow?

Hooks can now run in the background without blocking Claude Code's execution. Just add async: true to your hook config.

Great for logging, notifications, or any side-effect that shouldn't slow things down.

https://x.com/bcherny/status/2015524460481388760?s=46

Proposed fix

No response