feat: split plugins and cleanup

tests/fixtures/native-host-plugin.ts

@@ -1,4 +1,4 @@
-import { Plugin, Agent, Model, Provider } from "@opencode/plugin/effect";
+import { Plugin, Agent } from "@opencode/plugin/effect";
 import { Rpc } from "@opencode/plugin/rpc";
 import { Session } from "@opencode/schema/session";
 import { SessionMessage } from "@opencode/schema/session-message";
@@ -6,7 +6,7 @@ import { Tool } from "@opencode/schema/tool";
 import { Cause, Effect } from "effect";
 import { z } from "zod";
 import { appendFile } from "node:fs/promises";
-import plugin from "../../src/index.js";
+import multiWork from "../../src/multi-work.js";
 
 const probe = Rpc.define({
     id: "multi-work-test",
@@ -24,25 +24,10 @@ const probe = Rpc.define({
 });
 
 export default Plugin.define({
-    id: plugin.id,
+    id: multiWork.id,
     effect: (context) =>
         Effect.gen(function* () {
-            const providerID = Provider.ID.make("fixture");
-            yield* context.provider.transform((editor) =>
-                editor.add({
-                    info: {
-                        ...Provider.Info.empty(providerID),
-                        name: "Isolated fixture",
-                        activation: "enabled",
-                        package: "@opencode/ai/providers/openai-compatible",
-                        settings: { baseURL: process.env.FIXTURE_MODEL_URL! },
-                    },
-                    models: ["gpt-6-luna", "gpt-6.1-sol", "gpt-6-astra"].map((id) =>
-                        Model.Info.default(providerID, Model.ID.make(id)),
-                    ),
-                }),
-            );
-            yield* plugin.effect({ ...context, options: { provider: "fixture" } });
+            yield* multiWork.effect(context);
             let delegate: Tool.Info | undefined;
             yield* context.tool.transform((editor) => {
                 delegate = editor.get("subagent");