fix: improve WSL2 systemd daemon hints

src/commands/onboard-helpers.ts

@@ -13,6 +13,7 @@ import { callGateway } from "../gateway/call.js";
 import { normalizeControlUiBasePath } from "../gateway/control-ui.js";
 import { isSafeExecutableValue } from "../infra/exec-safety.js";
 import { pickPrimaryTailnetIPv4 } from "../infra/tailnet.js";
+import { isWSL } from "../infra/wsl.js";
 import { runCommandWithTimeout } from "../process/exec.js";
 import type { RuntimeEnv } from "../runtime.js";
 import { stylePromptTitle } from "../terminal/prompt-style.js";
@@ -91,27 +92,6 @@ type BrowserOpenSupport = {
   command?: string;
 };
 
-let wslCached: boolean | null = null;
-
-async function isWSL(): Promise<boolean> {
-  if (wslCached !== null) return wslCached;
-  if (process.platform !== "linux") {
-    wslCached = false;
-    return wslCached;
-  }
-  if (process.env.WSL_INTEROP || process.env.WSL_DISTRO_NAME || process.env.WSLENV) {
-    wslCached = true;
-    return wslCached;
-  }
-  try {
-    const release = (await fs.readFile("/proc/version", "utf8")).toLowerCase();
-    wslCached = release.includes("microsoft") || release.includes("wsl");
-  } catch {
-    wslCached = false;
-  }
-  return wslCached;
-}
-
 type BrowserOpenCommand = {
   argv: string[] | null;
   reason?: string;