ticket: start web console mvp

.yoi/tickets/00001KVZ9JGK0/item.md

@@ -2,7 +2,7 @@
 title: 'Backend内蔵Companion RuntimeとWeb Console MVP'
 state: 'inprogress'
 created_at: '2026-06-25T11:45:17Z'
-updated_at: '2026-06-26T07:42:06Z'
+updated_at: '2026-06-26T07:43:09Z'
 assignee: null
 queued_by: 'workspace-panel'
 queued_at: '2026-06-25T20:34:27Z'

.yoi/tickets/00001KVZ9JGK0/thread.md

@@ -213,3 +213,23 @@ Embedded Runtime connection、WebSocket observation proxy、Profile/config bundl
 これ以降、worktree creation / coder Worker routing などの implementation side effect に進める。
 
 ---
+
+<!-- event: implementation_report author: yoi-orchestrator at: 2026-06-26T07:43:09Z -->
+
+## Implementation report
+
+Implementation kickoff:
+
+- Worktree created: `/home/hare/Projects/yoi/.worktree/00001KVZ9JGK0-web-console-mvp`
+- Branch: `work/00001KVZ9JGK0-web-console-mvp`
+- Coder Worker spawned: `yoi-coder-00001KVZ9JGK0-web-console`
+
+Scope notes:
+- Coder has read access to the implementation worktree and non-recursive workspace root identity path needed by runtime startup.
+- Coder write scope is limited to `crates/workspace-server/**`, `web/workspace/**`, `resources/prompts/**`, root `Cargo.toml`, `Cargo.lock`, and `package.nix` if dependency/package changes are needed.
+- Coder is instructed not to modify Ticket records and not to operate in root/orchestration worktrees.
+
+Queued capacity note:
+- `00001KW04A8K6` remains queued while Web Console MVP is inprogress because both are UI/control-surface consumers of the new Runtime APIs; TUI migration should start after this branch is reviewed/merged/done.
+
+---