## Phase 2a - Task 4: Add provider lookup + ValidateVersion to cmd/single.go before CreateStandaloneSandbox. **Plan:** docs/superpowers/plans/2026-03-24-phase2a-provider-abstraction.md
Phase 2a - Task 4: Add provider lookup + ValidateVersion to cmd/single.go before CreateStandaloneSandbox.
Plan: docs/superpowers/plans/2026-03-24-phase2a-provider-abstraction.md