Introduce GEMINI_CLI_HOME for strict test isolation (#15907)

packages/cli/src/utils/resolvePath.test.ts

@@ -13,6 +13,10 @@ vi.mock('node:os', () => ({
   homedir: vi.fn(),
 }));
 
+vi.mock('@google/gemini-cli-core', () => ({
+  homedir: () => os.homedir(),
+}));
+
 describe('resolvePath', () => {
   beforeEach(() => {
     vi.mocked(os.homedir).mockReturnValue('/home/user');