初始提交：terminalX 可运行态（M0/M1/M1.5 已真机验证）

- M0: libghostty SSH 终端（渲染/输入/连接）+ 白屏修复(OutputGate) + 会话状态机/自动重连
- M1: tsnet 用户态组网 + SSH-over-tsnet(fd 桥)，shell 级真机验证；R5(Go+gvisor+C+++Swift 同进程) retire
- M1.5: tmux -CC 原生 tab（MVP）
- 结构: packages/(TXCore·TXTransport), apps/TerminalX, vendor/(libghostty-spm/libssh2/mbedtls/tsnet-bridge), artifacts/
- 文档: CLAUDE.md + docs/HANDOFF.md（新会话入口）
- 环境: 认证代理→依赖 vendor 本地化；Go 在 ~/.local/go；仅模拟器/未签名
- 待续: M2 mosh, tmux 多 pane, M4 安全(host key/SE)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

vendor/libssh2/vms/libssh2_config.h

@@ -0,0 +1,89 @@
+/* Copyright (C) The libssh2 project and its contributors.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef LIBSSH2_CONFIG_H
+#ifdef __VMS
+
+#define LIBSSH2_CONFIG_H
+
+/* VMS specific libssh2_config.h
+ */
+
+#define ssize_t SSIZE_T
+
+typedef unsigned int uint32_t;
+typedef unsigned int socklen_t; /* missing in headers on VMS */
+
+/* Have's */
+
+#define HAVE_UNISTD_H
+#define HAVE_INTTYPES_H
+#define HAVE_SYS_TIME_H
+#define HAVE_SELECT
+#define HAVE_UIO
+
+#define HAVE_SYS_SOCKET_H
+#define HAVE_NETINET_IN_H
+#define HAVE_ARPA_INET_H
+
+#define HAVE_GETTIMEOFDAY 1
+#define HAVE_SNPRINTF 1
+
+#define POSIX_C_SOURCE
+
+/* Enable the possibility of using tracing */
+
+#define LIBSSH2DEBUG 1
+
+/* For selection of proper block/unblock function in session.c */
+
+#define HAVE_FIONBIO
+
+#include <stropts.h>
+
+/* In VMS TCP/IP Services and some BSD variants SO_STATE retrieves
+ * a bitmask revealing amongst others the blocking state of the
+ * socket. On VMS the bits are undocumented, but  SS_NBIO
+ * works, I did not test the other bits. Below bitdefs are
+ * from Berkely source socketvar.h at
+ * http://ftp.fibranet.cat/UnixArchive/PDP-11/Trees/2.11BSD/sys/h/socketvar.h
+ *  Socket state bits.
+ *  #define SS_NOFDREF          0x001    no file table ref any more
+ *  #define SS_ISCONNECTED      0x002    socket connected to a peer
+ *  #define SS_ISCONNECTING     0x004    in process of connecting to peer
+ *  #define SS_ISDISCONNECTING  0x008    in process of disconnecting
+ *  #define SS_CANTSENDMORE     0x010    can't send more data to peer
+ *  #define SS_CANTRCVMORE      0x020    can't receive more data from peer
+ *  #define SS_RCVATMARK        0x040    at mark on input
+ *  #define SS_PRIV             0x080    privileged for broadcast, raw...
+ *  #define SS_NBIO             0x100    non-blocking ops
+ *  #define SS_ASYNC            0x200    async i/o notify
+ *
+ */
+
+#ifdef SO_STATE
+
+/* SO_STATE is defined in stropts.h  by DECC
+ * When running on Multinet, SO_STATE renders a protocol
+ * not started error. Functionally this has no impact,
+ * apart from libssh2 not being able to restore the socket
+ * to the proper blocking/non-blocking state.
+ */
+
+#define SS_NBIO         0x100
+
+#endif
+
+/* Use OpenSSL */
+#define LIBSSH2_OPENSSL 1
+
+/* Compile in zlib support. We link against gnv$libzshr, as available
+ * from https://sourceforge.net/projects/vms-ports/files/.
+ */
+
+#define LIBSSH2_HAVE_ZLIB
+
+#endif /* __VMS */
+#endif /* LIBSSH2_CONFIG_H */