Fix mock isolation in scope-filtering.test.ts

- Narrow mock.module() targets to prevent barrel export contamination
- Ensure proper cleanup after tests

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src/features/claude-code-mcp-loader/scope-filtering.test.ts

@@ -15,7 +15,7 @@ describe("loadMcpConfigs", () => {
       homedir: () => TEST_HOME,
       tmpdir,
     }))
-    mock.module("../../shared", () => ({
+    mock.module("../../shared/claude-config-dir", () => ({
       getClaudeConfigDir: () => join(TEST_HOME, ".claude"),
     }))
     mock.module("../../shared/logger", () => ({