workspace: stabilize cleanup plan digest

.yoi/tickets/00001KXDTPXFD/item.md

@@ -1,8 +1,8 @@
 ---
 title: 'Stabilize cleanup plan ordering'
-state: 'inprogress'
+state: 'done'
 created_at: '2026-07-13T13:29:51Z'
-updated_at: '2026-07-13T13:30:39Z'
+updated_at: '2026-07-13T13:38:25Z'
 assignee: null
 queued_by: 'yoi ticket'
 queued_at: '2026-07-13T13:30:39Z'

.yoi/tickets/00001KXDTPXFD/thread.md

@@ -39,4 +39,44 @@ Ticket を `yoi ticket` が queued にしました。
 State changed to `inprogress`.
 
 
+---
+
+<!-- event: implementation_report author: hare at: 2026-07-13T13:38:25Z -->
+
+## Implementation report
+
+Stabilized cleanup plan candidate ordering and verified the not-found Workdir deletion endpoint.
+
+Root cause:
+- Cleanup plan digest includes worker/workdir candidate arrays.
+- Candidate order was not normalized before digest calculation, so GET `/cleanup-plan` and POST `/cleanup-executions` could compute different digests for the same target set.
+- The POST then failed with `workspace_cleanup_plan_stale`, preventing `workdir_record_delete` execution.
+
+Changes:
+- Sort worker cleanup candidates by `target_id` before digest calculation.
+- Sort Workdir cleanup candidates by `target_id` before digest calculation.
+
+Endpoint verification:
+- Fetched `GET /api/w/0197a949-4b6b-7f2a-9d9a-1f87e3a4c5b6/runtimes/arc/cleanup-plan`.
+- Posted the returned revision/digest and all `file_status: not_found` Workdir target ids to `POST /cleanup-executions`.
+- Received HTTP 200 and four `workdir_record_delete` results with `status: deleted`.
+
+Validation:
+- `cargo fmt --check`
+- `git diff --check`
+- `cargo check -q`
+- `cargo test -q -p yoi-workspace-server`
+- targeted cleanup plan test
+- `nix build .#yoi --no-link`
+
+
+---
+
+<!-- event: state_changed author: "yoi ticket" at: 2026-07-13T13:38:25Z from: inprogress to: done reason: cli_state field: state -->
+
+## State changed
+
+State changed to `done`.
+
+
 ---