Issue: Migrate to BoringSSL v5 certificate compression and restore TLS handshakes

Issue: Migrate to BoringSSL v5 certificate compression and restore TLS handshakes: a task in LegoFlow-SWE (Harbor dataset). After upgrading the underlying BoringSSL binding to the v5 series (5.0.0-alpha.1) to pick up security improvements, the library’s existing certificate compression integration…