Converts the host OpenCode config.skills object (with paths/urls arrays set by other plugins like superpowers) into the SkillsConfig format used by discoverConfigSourceSkills. Filters blank/whitespace entries and non-string values.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
YeonGyu-Kim