refactor(core): convert opencode tests to nodes (#34453)

packages/opencode/src/acp/session.ts

@@ -1,5 +1,6 @@
 import type { McpServer } from "@agentclientprotocol/sdk"
 import type { Message, Part } from "@opencode-ai/sdk/v2"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { ProviderV2 } from "@opencode-ai/core/provider"
 import { ModelV2 } from "@opencode-ai/core/model"
 import { Context, Effect, Layer, Ref } from "effect"
@@ -202,6 +203,8 @@ export const layer = Layer.effect(
 
 export const defaultLayer = layer
 
+export const node = LayerNode.make({ service: Service, layer, deps: [] })
+
 function makeSession(input: StoreInput): Info {
   return {
     id: input.id,