0.19.3 (2026-03-03) Full Changelog: v0.19.2...v0.19.3 Chores internal: add request options to SSE classes (c17f87b) internal: make test_proxy_environment_variables more resilient (6f2864d) internal: make test_proxy_environment_variables more resilient to env (6af2338) internal: remove mock server code (e586a7f) update mock server docs (4bd2467)