refactor(hooks): rename sisyphus-orchestrator to atlas

- Rename SisyphusOrchestratorHookOptions → AtlasHookOptions
- Rename createSisyphusOrchestratorHook → createAtlasHook
- Update hook name in schema: sisyphus-orchestrator → atlas
- Update all documentation references
- Rename image: orchestrator-sisyphus.png → orchestrator-atlas.png

src/hooks/index.ts

@@ -28,5 +28,5 @@ export { createEditErrorRecoveryHook } from "./edit-error-recovery";
 export { createPrometheusMdOnlyHook } from "./prometheus-md-only";
 export { createTaskResumeInfoHook } from "./task-resume-info";
 export { createStartWorkHook } from "./start-work";
-export { createSisyphusOrchestratorHook } from "./atlas";
+export { createAtlasHook } from "./atlas";
 export { createDelegateTaskRetryHook } from "./delegate-task-retry";