chore: reorg files

tests/fixtures/native-host-plugin.ts

@@ -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 multiWork from "../../src/multi-work.js";
+import multiWork from "../../src/multi-work/multi-work.js";
 
 const probe = Rpc.define({
     id: "multi-work-test",