test(setup): use verified commands in positive uninstall fixtures

Fixes #3301

Co-authored-by: Kaoru0822 <208281322+kaoru0822-kitauji@users.noreply.github.com>

tests/boundary/filesystem/clientConfigurationBom.test.ts

@@ -9,6 +9,7 @@ import {
   parseClientConfiguration,
 } from "../../../src/application/ClientConfigurationDocument.js";
 import { readClientRegistrationStatuses } from "../../../src/application/ClientRegistrationStatus.js";
+import { npxRegistrationCommand } from "../../../src/application/ClientRegistrationIdentity.js";
 import {
   clientConfigurationAligned,
   configureClientConfiguration,
@@ -16,6 +17,7 @@ import {
 } from "../../../src/application/SetupClientConfiguration.js";
 import { systemUninstallHost } from "../../../src/application/Uninstall.js";
 import { supportedClients } from "../../../src/application/SupportedClients.js";
+import { PRODUCT_IDENTITY } from "../../../src/identity.js";
 import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
 
 describe.each([
@@ -137,8 +139,9 @@ it("restores original BOM-prefixed JSONC bytes after update and removal", async
   await mkdir(dirname(client.configPath), { recursive: true });
   await writeFile(client.configPath, original);
 
-  const firstCommand = [join(home, "bin", "rea"), "mcp"];
-  const updatedCommand = [join(home, "updated", "bin", "rea"), "mcp"];
+  // Both launchers establish ownership; arbitrary absolute prefixes do not.
+  const firstCommand = npxRegistrationCommand();
+  const updatedCommand = [PRODUCT_IDENTITY.cliBinary, "mcp"];
   expect(
     await configureClientConfiguration(client, {}, firstCommand),
   ).toMatchObject({ status: "configured" });

tests/boundary/filesystem/clientLifecycle.test.ts

@@ -1335,7 +1335,7 @@ describe("Codex configuration comments", () => {
       await configureClientConfiguration(
         { name: "codex", configPath, format: "toml" },
         {},
-        ["/isolated prefix/bin/rea", "mcp"],
+        [PRODUCT_IDENTITY.cliBinary, "mcp"],
       ),
     ).toMatchObject({ status: "configured" });
     const configured = await readFile(configPath, "utf8");
@@ -1505,7 +1505,7 @@ describe("client configuration filesystem removal", () => {
       cursor,
       JSON.stringify({
         mcpServers: {
-          rea: { command: "/isolated prefix/bin/rea", args: ["mcp"] },
+          rea: { command: PRODUCT_IDENTITY.cliBinary, args: ["mcp"] },
           other: { command: "other" },
         },
       }),