fix: centralize Windows exec handling and async migrations (#318)

* Add Windows exec foundation helpers

* server: centralize windows exec handling phase 2

* migrate cli daemon status to execCommand

* refactor: complete phase 4 async exec migrations

* test: cover windows exec helpers

* fix: use beforeEach for context.skip in test setup

packages/server/src/utils/spawn.test.ts

@@ -0,0 +1,54 @@
+import { mkdtempSync, realpathSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, test } from "vitest";
+
+import { execCommand } from "./spawn.js";
+
+describe("execCommand", () => {
+  const tempDirs: string[] = [];
+
+  afterEach(() => {
+    for (const tempDir of tempDirs) {
+      rmSync(tempDir, { recursive: true, force: true });
+    }
+    tempDirs.length = 0;
+  });
+
+  test("returns stdout and stderr for a successful command", async () => {
+    await expect(execCommand("echo", ["hello"])).resolves.toEqual({
+      stdout: "hello\n",
+      stderr: "",
+    });
+  });
+
+  test("rejects when the command times out", async () => {
+    const command =
+      process.platform === "win32"
+        ? {
+            command: process.execPath,
+            args: ["-e", "setTimeout(() => {}, 10_000)"],
+          }
+        : { command: "sleep", args: ["10"] };
+
+    await expect(execCommand(command.command, command.args, { timeout: 100 })).rejects.toThrow();
+  });
+
+  test("runs the command in the provided cwd", async () => {
+    const cwd = realpathSync(mkdtempSync(path.join(tmpdir(), "spawn-test-")));
+    tempDirs.push(cwd);
+
+    const command =
+      process.platform === "win32"
+        ? {
+            command: process.execPath,
+            args: ["-e", "console.log(process.cwd())"],
+          }
+        : { command: "pwd", args: [] };
+
+    await expect(execCommand(command.command, command.args, { cwd })).resolves.toEqual({
+      stdout: `${cwd}\n`,
+      stderr: "",
+    });
+  });
+});