note: Queue routing checked after Dashboard Queue. This Backend RuntimeRegistry foundation Ticket depends on `00001KVZBCQH4` worker-runtime core. That dependency is currently inprogress and only at coder implementation report stage, not reviewed/merged/done, so implementation side effects for this Ticket are blocked.

author: yoi-orchestrator


note: `00001KVZBCQH4` が done になり dependency blocker 解消。FS store Ticket とは主対象が workspace-server vs worker-runtime feature で分離できるため並行受理候補。

summary: worker-runtime core done 後の Backend RuntimeRegistry foundation slice。embedded/remote 実 handle は作らず、workspace-server の Registry identity/projection/error boundary と local compatibility source naming/diagnostics を worker-runtime domain model に合わせる。

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 Registry identity/projection/error boundary と existing API behavior preservation を確認する。merge/validation/done/cleanup は Orchestrator が行う。