diff --git a/.yoi/tickets/00001KVMGAEJN/item.md b/.yoi/tickets/00001KVMGAEJN/item.md
index 857b1236..b35e7148 100644
--- a/.yoi/tickets/00001KVMGAEJN/item.md
+++ b/.yoi/tickets/00001KVMGAEJN/item.md
@@ -2,7 +2,7 @@
 title: 'Plugin: URL 権限ベースの WebSocket host API を実装する'
 state: 'closed'
 created_at: '2026-06-21T07:11:34Z'
-updated_at: '2026-06-21T13:26:27Z'
+updated_at: '2026-06-21T13:27:28Z'
 assignee: null
 readiness: 'implementation_ready'
 risk_flags: ['plugin', 'host-api', 'websocket', 'service', 'ingress', 'lifecycle', 'permissions', 'security', 'persistence']
diff --git a/.yoi/tickets/00001KVMGAEJN/thread.md b/.yoi/tickets/00001KVMGAEJN/thread.md
index e7aa1d44..02ab7dc7 100644
--- a/.yoi/tickets/00001KVMGAEJN/thread.md
+++ b/.yoi/tickets/00001KVMGAEJN/thread.md
@@ -592,3 +592,22 @@ URL permission based Plugin WebSocket host API を実装し、Orchestrator workt
 - SecretRef-based credential injection は future follow-up。
 
 ---
+
+<!-- event: implementation_report author: yoi-orchestrator at: 2026-06-21T13:27:28Z -->
+
+## Implementation report
+
+Post-close cleanup completed。
+
+- Stopped child Pods and reclaimed scope:
+  - `yoi-coder-00001KVMGAEJN`
+  - `yoi-reviewer-00001KVMGAEJN-r1`
+- Removed implementation worktree:
+  - `/home/hare/Projects/yoi/.worktree/00001KVMGAEJN-plugin-websocket-host-api`
+- Deleted implementation branch:
+  - `impl/00001KVMGAEJN-plugin-websocket-host-api`
+- Orchestrator worktree remains clean on `orchestration` at `e8103477`。
+
+Root/original workspace was not used for merge/validation/cleanup operations。
+
+---