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/model-capabilities.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, test, mock } from "bun:test"
+import { afterAll, describe, expect, test, mock } from "bun:test"
 
 // Mock connected-providers-cache to prevent local disk cache from polluting test results.
 // Without this, findProviderModelMetadata reads real cached model metadata (e.g., from opencode serve)
@@ -10,6 +10,10 @@ mock.module("./connected-providers-cache", () => ({
   hasProviderModelsCache: () => false,
 }))
 
+afterAll(() => {
+  mock.restore()
+})
+
 import {
   getModelCapabilities,
   getBundledModelCapabilitiesSnapshot,