UserControllerTest: replaces fully-qualified org.mockito.Mockito.verify() and ArgumentMatchers.eq() with the static imports already present in the file. LoginRateLimiterTest: replaces three org.assertj.core.api.Assertions.assertThat() calls with the static-import form; adds missing assertThat import. Addresses Felix Suggestions 2 and 4 from PR #617 review. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>