board: 20 → in-progress (istos)

tasks/in-progress/20-replicas-render-actors-act.md

@@ -1,6 +1,7 @@
 # 20 — Replica etiquette: the actor's board acts, everyone else renders
 
-**Status:** Backlog
+**Status:** In Progress
+**Assignee:** istos
 **Priority:** High — without it, task 19 turns every board action into N duplicate side effects
 **Type:** Feature
 **Depends on:** 18, 19 — etiquette for a fleet that exists only once