Screen flashing on macOS iTerm2

[notgitika]

Description

The CLI causes screen flashing/flickering when used in iTerm2 on macOS. No further details were provided in the original report.

Category

Bug

Steps to Reproduce

1. Open iTerm2 on macOS
2. Run an agentcore CLI command (specific command TBD)
3. Observe screen flashing

Expected Behavior

The CLI should render without visual glitches or screen flashing.

Actual Behavior

Screen flashes/flickers during CLI usage in iTerm2.

Acceptance Criteria

• No screen flashing or flickering when using the CLI in iTerm2 on macOS
• Verify fix across common terminal emulators (iTerm2, Terminal.app)

Additional Context

• Needs reproduction details — which commands trigger the flashing?
• May be related to TUI rendering/refresh logic