Surface actionable errors when agentcore deploy fails

[tejaskash]

Description

When agentcore deploy fails due to a CDK/CloudFormation error, the CLI shows a generic failure message with no guidance. Users must manually dig through CloudFormation logs to understand what went wrong.

Category

Bug

Steps to Reproduce

1. Create a project with memory (or other resources)
2. Run agentcore deploy
3. Wait for deployment to fail
4. Observe the error message

Expected Behavior

The CLI should surface the specific CloudFormation error and provide actionable guidance on how to fix it.

Actual Behavior

The CLI shows a generic error. Users must manually inspect CloudFormation logs in the AWS console to diagnose the issue.

Acceptance Criteria

• Parse and display CDK/CloudFormation error details directly in CLI output
• Include the specific resource and reason for failure
• Provide a suggestion or next step where possible (e.g., "Check IAM permissions for...")
• Include a direct link or command to view full CloudFormation logs if needed