diff --git a/.yoi/tickets/00001KVZD10ED/artifacts/orchestration-plan.jsonl b/.yoi/tickets/00001KVZD10ED/artifacts/orchestration-plan.jsonl
new file mode 100644
index 00000000..d2fe0c57
--- /dev/null
+++ b/.yoi/tickets/00001KVZD10ED/artifacts/orchestration-plan.jsonl
@@ -0,0 +1 @@
+{"id":"orch-plan-20260625-132518-1","ticket_id":"00001KVZD10ED","kind":"accepted_plan","accepted_plan":{"summary":"Ticket `00001KVZD10ED` は implementation_ready。専用 worktree `/home/hare/Projects/yoi/.worktree/00001KVZD10ED-llm-engine-rename` と branch `work/00001KVZD10ED-llm-engine-rename` で、`llm-worker` / `llm-worker-macros` を `llm-engine` / `llm-engine-macros` に rename し、主要 public turn-engine 型を `Worker` から `Engine` 系へ rename する。責務移動や worker-runtime 実装、互換 alias は non-goal。","branch":"work/00001KVZD10ED-llm-engine-rename","worktree":"/home/hare/Projects/yoi/.worktree/00001KVZD10ED-llm-engine-rename","role_plan":"Orchestrator: accept/routing, worktree creation, final integration/validation/cleanup. Coder: repository-wide crate/type rename in dedicated child worktree. Reviewer: read-only review focusing on mechanical rename completeness, no compatibility alias, no behavior/authority movement, and validation evidence."},"author":"yoi-orchestrator","at":"2026-06-25T13:25:18Z"}
diff --git a/.yoi/tickets/00001KVZD10ED/item.md b/.yoi/tickets/00001KVZD10ED/item.md
index 5aef016b..9bc20ca6 100644
--- a/.yoi/tickets/00001KVZD10ED/item.md
+++ b/.yoi/tickets/00001KVZD10ED/item.md
@@ -2,7 +2,7 @@
 title: 'llm-worker crateをllm-engineへ改名する'
 state: 'queued'
 created_at: '2026-06-25T12:45:38Z'
-updated_at: '2026-06-25T13:24:26Z'
+updated_at: '2026-06-25T13:26:00Z'
 assignee: null
 queued_by: 'workspace-panel'
 queued_at: '2026-06-25T13:24:26Z'
diff --git a/.yoi/tickets/00001KVZD10ED/thread.md b/.yoi/tickets/00001KVZD10ED/thread.md
index c790479e..5f5ca942 100644
--- a/.yoi/tickets/00001KVZD10ED/thread.md
+++ b/.yoi/tickets/00001KVZD10ED/thread.md
@@ -30,4 +30,81 @@ Marked ready by `yoi ticket state`.
 Ticket を `workspace-panel` が queued にしました。
 
 
+---
+
+<!-- event: decision author: yoi-orchestrator at: 2026-06-25T13:26:00Z -->
+
+## Decision
+
+Routing decision: implementation_ready
+
+Reason:
+- Dashboard Queue により人間が Orchestrator routing を許可した queued Ticket として確認した。
+- Ticket body は `llm-worker` / `llm-worker-macros` crate rename、Rust import path rename、major public type rename (`Worker` -> `Engine`, config/result/error names)、repo-wide references、validation を具体的に列挙している。
+- `TicketRelationQuery` は blocking relation 0 件、`TicketOrchestrationPlanQuery` は routing 前 plan 0 件だった。
+- bounded context check で repository-wide `llm-worker` / `llm_worker` references を確認し、主な変更 surface は `crates/llm-worker`, `crates/llm-worker-macros`, workspace/dependency metadata, `pod`/`manifest` imports, docs/tests/examples/Nix/Cargo.lock である。これは大きめだが mechanical rename task として明確で、責務移動や WorkerRuntime 実装は non-goal として分離されている。
+- risk は API/naming churn だが、受け入れ条件と validation が明確で、Coder の bounded implementation latitude に収まる。planning return が必要な未決定事項は見つからない。
+
+Evidence checked:
+- Ticket body / thread: `item.md`, `thread.md`。thread は create、planning->ready、ready->queued のみで未解決 blocker は記録されていない。
+- Relations / orchestration plan: relation 0 件、routing 前 plan 0 件。accepted plan `orch-plan-20260625-132518-1` を記録済み。
+- Code context: `git grep` で `crates/llm-worker`, `crates/llm-worker-macros`, `llm_worker`, `llm_worker_macros`, `Worker` imports/examples/tests/docs references を確認。
+- Workspace state: `/home/hare/Projects/yoi/.worktree/orchestration` は clean。queued Ticket はこの 1 件、inprogress Ticket は 0 件。
+
+IntentPacket:
+
+Intent:
+- LLM turn-processing crate を `llm-worker` から `llm-engine` へ rename し、public turn-engine主体型を `Worker` から `Engine` 系へ rename することで、今後の Runtime-scoped Worker concept と衝突しない package/API naming に整理する。
+
+Binding decisions / invariants:
+- `llm-engine` は LLM turn engine。Runtime / Worker identity / process lifecycle / socket protocol / session file authority は持たない。
+- 責務移動は最小限。provider request/stream handling、tool-call loop、reasoning/usage/retry/continuation/history/callback semantics は変えない。
+- `crates/llm-worker` / `crates/llm-worker-macros` は残さない。
+- `llm-worker` / `llm_worker` / `llm_worker_macros` compatibility alias は作らない。
+- `pod` crate and dependents should compile against `llm_engine::Engine` and renamed config/result/error types.
+- New `worker-runtime` crate or Pod->Worker migration is non-goal.
+
+Requirements / acceptance criteria:
+- `crates/llm-engine` and `crates/llm-engine-macros` exist; old directories gone.
+- Cargo package/dependency names and Rust import paths use `llm-engine` / `llm_engine` and `llm-engine-macros` / `llm_engine_macros`.
+- Public turn-engine type is `llm_engine::Engine`, not `Worker`; config/result/error names no longer use `Worker` for the turn engine concept.
+- Repository-wide old references are gone except intentional historical/migration notes if any.
+- `pod`, `manifest`, `yoi`, examples/tests/docs/Nix/Cargo.lock update consistently.
+- Existing runtime behavior is unchanged except names.
+- Validation target includes `cargo test -p llm-engine`, `cargo test -p pod`, `cargo check -p yoi`, `git diff --check`, `nix build .#yoi --no-link`.
+
+Implementation latitude:
+- Result/output type exact names may follow Ticket guidance (`EngineRunResult`, `EngineRunOutput`, etc.) as long as public API no longer presents LLM turn engine as Worker.
+- Internal file names may be renamed for clarity (`worker.rs` -> `engine.rs`) if practical; otherwise public module/API must be clean.
+- Historical ticket ids or changelog-like references may remain only if clearly intentional and not active API/docs guidance.
+
+Escalate if:
+- Rename requires behavior changes to provider streaming/tool-loop/history semantics.
+- A compatibility alias appears necessary to make internal crates compile.
+- Existing macro/test generated names cannot be renamed without broader procedural macro redesign.
+- `cargo test -p pod` failure is not the known prompt guidance snapshot caveat but a rename regression.
+
+Validation:
+- `cargo test -p llm-engine`
+- `cargo test -p pod`
+- `cargo check -p yoi`
+- `git diff --check`
+- `nix build .#yoi --no-link`
+- Add focused grep evidence for old names.
+
+Current code map:
+- Primary: `crates/llm-worker`, `crates/llm-worker-macros`, workspace `Cargo.toml`, `Cargo.lock`, `package.nix`。
+- Secondary: dependent imports in `crates/pod`, `crates/manifest`, examples/tests/docs/resources as found by grep。
+- Avoid: worker-runtime implementation, Pod runtime migration, session/socket authority changes, provider/tool-loop behavior changes。
+
+Critical risks / reviewer focus:
+- stale old crate/import/type references。
+- hidden compatibility alias left behind。
+- behavior changes mixed into mechanical rename。
+- `Worker` remaining as public turn-engine主体名 where it conflicts with Runtime Worker concept。
+- Nix/Cargo lock/hash updates missed。
+
+Next action:
+- `queued -> inprogress` を記録してから worktree-workflow で `/home/hare/Projects/yoi/.worktree/00001KVZD10ED-llm-engine-rename` を作成し、multi-agent-workflow で Coder/Reviewer sibling loop に進める。
+
 ---