## Turn 1

We need to patch code to normalize email in get_user as well. Also test regression: login fails when email case differs. Provide patch plan: modify get_user to normalize email same as save_user. Also maybe adjust login to strip and lower. Provide test: create user with mixed case email, attempt login with different case, expect success. Also test failure when wrong password. Provide patch plan with file changes. Let's craft concise patch plan.