Add 2 additional JWT authentication tests: - test_init_with_empty_base_url_raises_error - test_init_with_whitespace_base_url_raises_error Improves JWT auth coverage slightly and adds validation coverage for base_url parameter. Tests: 442 → 444 (+2) Coverage: 79.32% → 79.35% (+0.03%) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>