In preview, with harness agentcore -> dev and agentcore dev are different experiences

[jesseturner21]

Description

When we run agentcore and then select dev. the deploy for a harness goes inline in the terminal but if you run agentcore dev it takes over the terminal and deploys with the standard terminal UI.

Steps to Reproduce

1. Run agentcore create with default harness
2. cd into project
3. run agentcore
4. select dev

Expected Behavior

It should do the same deploy as agentcore dev takes over terminal and has colors

Actual Behavior

It prints white lines in line outside the terminal

CLI Version

1.0.0-preview.9

Operating System

macOS

Additional Context

No response