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/docs/libssh2_trace_sethandler.3

@@ -0,0 +1,32 @@
+.\" Copyright (C) The libssh2 project and its contributors.
+.\" SPDX-License-Identifier: BSD-3-Clause
+.TH libssh2_trace_sethandler 3 "15 Jan 2010" "libssh2" "libssh2"
+.SH NAME
+libssh2_trace_sethandler - set a trace output handler
+.SH SYNOPSIS
+.nf
+#include <libssh2.h>
+
+typedef void (*libssh2_trace_handler_func)(LIBSSH2_SESSION *session,
+                                           void *context,
+                                           const char *data,
+                                           size_t length);
+
+int
+libssh2_trace_sethandler(LIBSSH2_SESSION *session,
+                         void *context,
+                         libssh2_trace_handler_func callback);
+.fi
+.SH DESCRIPTION
+libssh2_trace_sethandler installs a trace output handler for your application.
+By default, when tracing has been switched on via a call to libssh2_trace(),
+all output is written to stderr. By calling this method and passing a
+function pointer that matches the libssh2_trace_handler_func prototype,
+libssh2 will call back as it generates trace output. This can be used to
+capture the trace output and put it into a log file or diagnostic window.
+This function has no effect unless libssh2 was built to support this option,
+and a typical "release build" might not.
+
+\fBcontext\fP can be used to pass arbitrary user defined data back into the callback when invoked.
+.SH AVAILABILITY
+Added in libssh2 version 1.2.3