note: Queue routing checked after Dashboard Queue. Embedded Runtime connection depends on Backend RuntimeRegistry foundation `00001KVZKSV6C`, which is still queued and itself blocked by inprogress worker-runtime core `00001KVZBCQH4`. Do not start this Ticket until the foundation dependency is accepted/completed.

author: yoi-orchestrator


note: Dependencies are unblocked: `00001KVZKSV6C` RuntimeRegistry foundation is done; worker-runtime core is done. No active inprogress remains after WS proxy cleanup.

summary: Backend RuntimeRegistry に embedded `worker_runtime::Runtime` source を接続し、backend-internal Runtime として summary/status/capabilities、worker list/detail/create/input/transcript projection を direct lib call で扱えるようにする。remote process/FS/REST/WS/Web Console/Profile sync は扱わない。

role_plan: Orchestrator が dedicated child worktree を作成し、coder Worker に `crates/workspace-server` 中心の narrow write scope を委譲する。reviewer Worker は read-only で embedded Runtime registration、runtime_id+worker_id routing、no internal path/credential leak、local compatibility separation を確認する。merge/validation/done/cleanup は Orchestrator が行う。