refactor(command-config): use getAgentListDisplayName for consistent naming

Update command config handler and tests to use getAgentListDisplayName

for proper agent name resolution in command configurations.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>