refactor(server): canonicalize service API (#31049)

packages/server/src/handlers/agent.ts

@@ -0,0 +1,15 @@
+import { AgentV2 } from "@opencode-ai/core/agent"
+import { PluginBoot } from "@opencode-ai/core/plugin/boot"
+import { Effect } from "effect"
+import { HttpApiBuilder } from "effect/unstable/httpapi"
+import { Api } from "../api"
+import { response } from "../groups/location"
+
+export const AgentHandler = HttpApiBuilder.group(Api, "server.agent", (handlers) =>
+  handlers.handle("agent.list", () =>
+    Effect.gen(function* () {
+      yield* PluginBoot.Service.use((plugin) => plugin.wait())
+      return yield* response(AgentV2.Service.use((agent) => agent.all()))
+    }),
+  ),
+)