unhelpful error message on fresh project deployment summary

[Hweinstock]

Description

Steps to Reproduce

1. Create a fresh project with agentcore create.
2. run agentcore deploy --plan.
3. Observe unhelpful error message refrencing aws-targets.json.

Expected Behavior

A helpful message with actionable steps about the failure, and how to resolve.

Actual Behavior

An error message that only a developer on the project would likely understand.

CLI Version

No response

Operating System

macOS

Additional Context

No response