zsh malloc stack logging warning on macOS startup

[reddamazon]

Actual Behavior

When launching kiro-cli on macOS, the following warning appears:
"zsh (kiro-cli-term)(35738) MallocStackLogging: can't turn off malloc stack logging because it was not enabled."

This suggests kiro-cli is attempting to disable malloc stack logging that wasn't enabled in the first place.

Expected Behavior

kiro-cli should start without malloc-related warnings, or should check if MallocStackLogging is enabled before attempting to disable it.

Steps to Reproduce

1. Launch kiro-cli on macOS using kiro-cli chat
2. Observe the warning message in the terminal output

Environment

• OS: macOS
• Shell: zsh