execute-phase
Executes a plan-phase plan doc to completion. Spawns one worktree-isolated teammate per swim lane via TeamCreate, respects the lane DAG and interface freeze gates, auto-merges lanes when their verify passes, and retries once on failure before halting. Assigns each teammate a model + thinking level matched to the lane's complexity. Run after /plan-phase has produced plans/phase-plan-<VERSION>-<PHASE_ALIAS>.md.