refactor(agents): rename orchestrator-sisyphus to atlas
Rename agent file and update all references. Function createOrchestratorSisyphusAgent → createAtlasAgent. Metadata orchestratorSisyphusPromptMetadata → atlasPromptMetadata. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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