Why: Turn the approved multi-CLI routing design into independently testable Cursor implementation units without another manual plan gate.
Evidence: The plan self-review found R1-R10 coverage, stable interfaces, five review-focus tests, and no placeholders or whitespace errors.
Impact: Authorizes U1-U5 execution through fresh Cursor Agent runs while the host retains scope, verification, integration, and delivery control.
Refs: docs/superpowers/specs/2026-10-15-project-agent-execution-design.md
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