docs: finish zone entity workplan

workplans/RAIL-FAB-WP-0022-zone-entity-visualization-engine.md

@@ -4,7 +4,7 @@ type: workplan
 title: "Promote graph zones to first-class visualization entities"
 domain: railiance
 repo: railiance-fabric
-status: active
+status: finished
 owner: codex
 topic_slug: railiance-fabric
 created: "2026-05-24"
@@ -214,7 +214,7 @@ and restores the original graph view without changing the underlying payload.
 
 ```task
 id: RAIL-FAB-WP-0022-T07
-status: todo
+status: done
 priority: low
 state_hub_task_id: "4b6f0b7e-a066-490d-8160-ba23b03cf820"
 ```
@@ -229,6 +229,12 @@ a follow-up workplan for two-phase layout.
 Expected result: the codebase has a documented path toward per-zone layouts
 without destabilizing the current graph explorer.
 
+Result: Documented the per-zone layout preparation path in
+`docs/ZoneEntityVisualization.md`. The recommended direction is a two-phase
+layout: resolve zones and containers first, then compute local zone coordinates
+and project them into Cytoscape space. The note identifies the prerequisites
+already established by WP-0022 and avoids a premature nested-layout rewrite.
+
 ## Acceptance Criteria
 
 - Zone entity behavior is documented in `docs/ZoneEntityVisualization.md`.