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TDD RED phase - tests expect ZhihuLogin class that doesn't exist yet: - test_login_page_access: verify correct login URL - test_qrcode_screenshot: verify QR code capture and save - test_cookie_detection_with_z_c0: verify login detection - test_cookie_detection_without_z_c0: verify no login when missing z_c0 - test_cookie_extraction: verify cookie string format - test_login_timeout: verify timeout after 60s polling - test_result_model_success: verify success result model - test_result_model_failure: verify failure result model Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>