From 6a17366fcf5f4a6b1e7548c8b263618864f90992 Mon Sep 17 00:00:00 2001
From: Hare <kei.hiracchi.0928@gmail.com>
Date: Fri, 26 Jun 2026 01:50:53 +0900
Subject: [PATCH] ticket: record worker runtime lifecycle fix

---
 .yoi/tickets/00001KVZBCQH4/item.md   |  2 +-
 .yoi/tickets/00001KVZBCQH4/thread.md | 32 ++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/.yoi/tickets/00001KVZBCQH4/item.md b/.yoi/tickets/00001KVZBCQH4/item.md
index 3d69d6d2..9045d0b3 100644
--- a/.yoi/tickets/00001KVZBCQH4/item.md
+++ b/.yoi/tickets/00001KVZBCQH4/item.md
@@ -2,7 +2,7 @@
 title: 'worker-runtime core crateと組み込みRuntime APIを作る'
 state: 'inprogress'
 created_at: '2026-06-25T12:17:05Z'
-updated_at: '2026-06-25T16:49:53Z'
+updated_at: '2026-06-25T16:50:47Z'
 assignee: null
 queued_by: 'workspace-panel'
 queued_at: '2026-06-25T16:20:10Z'
diff --git a/.yoi/tickets/00001KVZBCQH4/thread.md b/.yoi/tickets/00001KVZBCQH4/thread.md
index cc438d49..562f9313 100644
--- a/.yoi/tickets/00001KVZBCQH4/thread.md
+++ b/.yoi/tickets/00001KVZBCQH4/thread.md
@@ -571,3 +571,35 @@ Human follow-up:
 - 現在の最優先は `00001KVZBCQH4` の reviewer blocker 解消、再 review、merge、validation、done 記録。
 
 ---
+
+<!-- event: implementation_report author: yoi-coder-00001KVZBCQH4-worker-runtime at: 2026-06-25T16:50:47Z -->
+
+## Implementation report
+
+Follow-up implementation report after review request_changes:
+
+対応内容:
+- `crates/worker-runtime/src/runtime.rs`
+  - `Runtime::transition_worker` を修正。
+  - `Stopped` / `Cancelled` の terminal 状態にある Worker に反対側 terminal 操作が呼ばれても、既存 terminal 状態を保持し、同じ `event_id` で ack を返すようにした。
+  - 反対側 terminal 操作では追加 event を発生させない。
+- 追加テスト:
+  - `stop_then_cancel_preserves_stopped_terminal_state`
+  - `cancel_then_stop_preserves_cancelled_terminal_state`
+  - summary count と event history が反対 terminal 操作で変化しないことを検証。
+
+Commit:
+- `fbd358a1 fix: keep worker terminal lifecycle stable`
+
+Validation:
+- `cargo fmt --all`: success
+- `cargo test -p worker-runtime`: success (8 tests passed)
+- `cargo check -p yoi`: success
+- `git diff --check`: success
+- `nix build .#yoi --no-link`: success（実行時点で dirty tree warning は出たが build 自体は成功）
+
+Residual risks / review focus:
+- terminal 状態への反対操作は reject ではなく「既存 terminal 状態を保持する idempotent 扱い」を選択。既存 API の ack semantics には自然だが、将来 UX/API で明示的 lifecycle conflict を出したい場合は typed error 方針へ切り替える余地がある。
+- child worktree は commit 後 clean。
+
+---