fix(test): restore shared Bun mocks after suite cleanup

Prevent src/shared batch runs from leaking module mocks into later files, which was breaking Linux CI cache metadata and legacy plugin warning assertions.

src/shared/log-legacy-plugin-startup-warning.test.ts

@@ -1,4 +1,4 @@
-import { beforeEach, describe, expect, it, mock } from "bun:test"
+import { afterAll, beforeEach, describe, expect, it, mock } from "bun:test"
 import type { LegacyPluginCheckResult } from "./legacy-plugin-warning"
 
 function createLegacyPluginCheckResult(
@@ -24,6 +24,10 @@ mock.module("./logger", () => ({
   log: mockLog,
 }))
 
+afterAll(() => {
+  mock.restore()
+})
+
 async function importFreshStartupWarningModule(): Promise<typeof import("./log-legacy-plugin-startup-warning")> {
   return import(`./log-legacy-plugin-startup-warning?test=${Date.now()}-${Math.random()}`)
 }