Raise Codecov patch coverage for config loader fallback paths

[Copilot]

Codecov patch failed because recently changed branches in packages/cli/src/config/loader.ts were not exercised by existing tests (codecov/patch reported 33.33% on the diff). This PR increases patch coverage by adding focused tests for the explicit-path and fallback code paths that were previously uncovered.

• Coverage gap addressed in config-loader tests

  • Extended packages/cli/tests/config-loader.test.ts to cover:
    • TS config discovery (autodocs.config.ts)
    • explicit JSON config path loading
    • null return when no config exists
    • explicit-path fallback when cosmiconfig returns null (JSON + JS paths)
    • wrapped loader error message path (Failed to load config: ...)

• Fallback/error branches tested without production code changes

  • Used jest.isolateModulesAsync + jest.doMock('cosmiconfig', ...) to force loader fallback branches deterministically.
  • Kept scope strictly to tests; no runtime behavior changes in CLI/core code.

• Cross-platform test hardening

  • Replaced hardcoded '/tmp' usage in error-path test with createTempDir() to avoid platform-specific assumptions.

await jest.isolateModulesAsync(async () => {
  jest.doMock('cosmiconfig', () => ({
    cosmiconfig: () => ({
      search: jest.fn(),
      load: jest.fn().mockResolvedValue(null),
    }),
  }));

  const { loadConfig } = await import('../src/config/loader');
  const config = await loadConfig(configPath); // explicit path fallback exercised
  expect(config?.output.dir).toBe('./fallback-json');
});

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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