workspace: preserve worker display names

.yoi/tickets/00001KX84V0C4/item.md

@@ -1,8 +1,8 @@
 ---
 title: 'Preserve requested Worker display names'
-state: 'inprogress'
+state: 'done'
 created_at: '2026-07-11T08:31:24Z'
-updated_at: '2026-07-11T08:31:54Z'
+updated_at: '2026-07-11T08:44:11Z'
 assignee: null
 queued_by: 'yoi ticket'
 queued_at: '2026-07-11T08:31:54Z'

.yoi/tickets/00001KX84V0C4/thread.md

@@ -39,4 +39,35 @@ Ticket を `yoi ticket` が queued にしました。
 State changed to `inprogress`.
 
 
+---
+
+<!-- event: implementation_report author: hare at: 2026-07-11T08:44:11Z -->
+
+## Implementation report
+
+Fixed Worker display name preservation.
+
+- Browser Worker create now records the sanitized UI display name in Backend worker registry instead of immediately syncing the Runtime worker id label.
+- Runtime Worker create API records `requested_worker_name` as display name when provided.
+- Later Runtime observation/list sync preserves existing registry display_name and only falls back to Runtime label for never-recorded live Workers.
+- Added coverage that a Worker created with empty browser display_name uses the default `Coding Worker` label in Workers list/detail while keeping worker id separate.
+
+Validation:
+- cargo test -q -p yoi-workspace-server
+- cd web/workspace && deno task check
+- cd web/workspace && deno task test
+- cargo test -q
+- git diff --check
+- nix build .#yoi --no-link
+
+
+---
+
+<!-- event: state_changed author: "yoi ticket" at: 2026-07-11T08:44:11Z from: inprogress to: done reason: cli_state field: state -->
+
+## State changed
+
+State changed to `done`.
+
+
 ---