ticket: complete workspace host workers

.yoi/tickets/00001KVNEKH9Q/resolution.md

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+Workspace backend に local Host / Worker read API を追加し、Web UI に Host / Worker list を表示する変更を統合した。
+
+主な成果:
+- Workspace backend に `/api/hosts`, `/api/workers`, `/api/hosts/{host_id}/workers` を追加。
+- `/api/runners` placeholder を削除 / Host-Worker naming に移行。
+- Local Pod metadata を read-only bridge として Worker domain object に投影。
+- Pod は primary domain ではなく `implementation: { kind: "local_pod", pod_name: ... }` として表現。
+- Worker response includes bounded `worker_id`, `host_id`, label/pod name, role/profile when known, `workspace_root`, state/status, implementation detail, and diagnostics。
+- Missing/unreadable Pod metadata root は process/server failure ではなく empty workers + bounded diagnostics / unavailable capability に degrade。
+- Session transcript / tool result / prompt contents / raw session JSONL は読まない。
+- Web UI static SPA に Host / Worker list を追加。
+- Existing Ticket / Objective canonical workflows remain unchanged。
+
+統合・検証:
+- Merge commit: `c884d517 merge: workspace host workers`
+- Implementation commit: `58143ead feat: expose workspace hosts and workers`
+- Reviewer final verdict: approve
+- Validation passed: `cargo fmt --check`, `git diff --check HEAD^1..HEAD`, `cargo test -p yoi-workspace-server`, `cargo check -p yoi-workspace-server`, `deno task check`, `deno task build`, `cargo run -p yoi -- ticket doctor`, and `nix build .#yoi --no-link`。
+
+範囲外:
+- Remote/cloud runner registration, scheduling, start/stop/attach/notify operations, and full run-worker correlation were not implemented。
+- Frontend remains static SPA and does not own backend business/lifecycle authority。