refactor: dedupe daemon exec wrappers

src/daemon/exec-file.ts

@@ -0,0 +1,32 @@
+import { execFile, type ExecFileOptionsWithStringEncoding } from "node:child_process";
+
+export type ExecResult = { stdout: string; stderr: string; code: number };
+
+export async function execFileUtf8(
+  command: string,
+  args: string[],
+  options: Omit<ExecFileOptionsWithStringEncoding, "encoding"> = {},
+): Promise<ExecResult> {
+  return await new Promise<ExecResult>((resolve) => {
+    execFile(command, args, { ...options, encoding: "utf8" }, (error, stdout, stderr) => {
+      if (!error) {
+        resolve({
+          stdout: String(stdout ?? ""),
+          stderr: String(stderr ?? ""),
+          code: 0,
+        });
+        return;
+      }
+
+      const e = error as { code?: unknown; message?: unknown };
+      const stderrText = String(stderr ?? "");
+      resolve({
+        stdout: String(stdout ?? ""),
+        stderr:
+          stderrText ||
+          (typeof e.message === "string" ? e.message : typeof error === "string" ? error : ""),
+        code: typeof e.code === "number" ? e.code : 1,
+      });
+    });
+  });
+}