- Reformat all C/H files to match .clang-format (LLVM style) - Fix 26 cppcheck const-correctness warnings (constParameterPointer, constVariablePointer, constVariable) - Update function declarations in headers to match const parameters
- New transport_tls.h/c: TLS server (server_create_tls, server_listen_tls) and client (client_connect_tls) using OpenSSL - protocol.c: io_set_ssl() + SSL_read/SSL_write in send_n_data/receive_n_data - transport_tcp.h: ssl/ssl_ctx fields added to Server/Client structs - config.h/c: use_tls, tls_cert, tls_key fields - client_cli.c: --tls, --cert, --key flags - server.c: --tls, --cert, --key, -p flags with TLS support - CMakeLists.txt: OpenSSL::SSL + OpenSSL::Crypto linkage - shell.nix: openssl added to buildInputs