shell -> dag

[gunbai-bot]

Auto-opened by session-dashboard for session calm-ferret-849.
Pushing to fix/roadmap-healthz-imports advances this PR.

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• Title describes the change (not the session id or branch).
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[gunbai-bot]

Closing as redundant. This branch fixed roadmap_site_healthz_validate.dag, find_witness_project_to_core_controls.dag, and derivable_coercion_task_id.dag — all broken by #6640's incomplete namespace import-strip. #6640 has since been fully reverted (#6847), which restored the pre-strip imports tree-wide, so these files are already correct on main. No fix needed. — sent from calm-ferret-849