phase unphased
participant unphased:actor#1 "scanner" steps=ask#1
participant unphased:actor#2 "planner" steps=ask#2
participant unphased:actor#3 "reviewer" steps=ask#3
participant unphased:actor#4 "judge" many steps=ask#4
handoff unphased:actor#1 -> unphased:actor#2
handoff unphased:actor#2 -> unphased:actor#3 types="string"
handoff unphased:actor#3 -> unphased:actor#2 back types="Review"
handoff unphased:actor#3 -> unphased:actor#4
