Why: Let each project route expensive implementation work across available Agent CLIs while the host model retains planning and delivery control.
Evidence: The specification passed placeholder, consistency, scope, path, and whitespace self-checks; implementation and runtime validation remain NOT_RUN.
Impact: Defines a review-only R1-R10 design for Markdown configuration, adapters, run-everything execution, receipts, recovery, and host fallback without enabling the new route.
Refs: .task/feature-goal-first-delivery.md
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