fix(update): harden root selection

src/cli/run-main.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, it } from "vitest";
+
+import { rewriteUpdateFlagArgv } from "./run-main.js";
+
+describe("rewriteUpdateFlagArgv", () => {
+  it("leaves argv unchanged when --update is absent", () => {
+    const argv = ["node", "entry.js", "status"];
+    expect(rewriteUpdateFlagArgv(argv)).toBe(argv);
+  });
+
+  it("rewrites --update into the update command", () => {
+    expect(rewriteUpdateFlagArgv(["node", "entry.js", "--update"])).toEqual([
+      "node",
+      "entry.js",
+      "update",
+    ]);
+  });
+
+  it("preserves global flags that appear before --update", () => {
+    expect(
+      rewriteUpdateFlagArgv(["node", "entry.js", "--profile", "p", "--update"]),
+    ).toEqual(["node", "entry.js", "--profile", "p", "update"]);
+  });
+
+  it("keeps update options after the rewritten command", () => {
+    expect(
+      rewriteUpdateFlagArgv(["node", "entry.js", "--update", "--json"]),
+    ).toEqual(["node", "entry.js", "update", "--json"]);
+  });
+});