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_session_callback_set.3

@@ -0,0 +1,31 @@
+.\" Copyright (C) The libssh2 project and its contributors.
+.\" SPDX-License-Identifier: BSD-3-Clause
+.TH libssh2_session_callback_set 3 "1 Jun 2007" "libssh2 0.15" "libssh2"
+.SH NAME
+libssh2_session_callback_set - set a callback function
+.SH SYNOPSIS
+.nf
+#include <libssh2.h>
+
+void *
+libssh2_session_callback_set(LIBSSH2_SESSION *session,
+                             int cbtype, void *callback);
+.fi
+.SH DESCRIPTION
+This function is \fBDEPRECATED\fP in 1.11.1. Use the
+\fIlibssh2_session_callback_set2(3)\fP function instead!
+
+This implementation is expecting and returning a data pointer for callback
+functions.
+
+For the details about the replacement function, see
+.BR libssh2_session_callback_set2(3)
+which is expecting and returning a function pointer.
+
+.SH RETURN VALUE
+Pointer to previous callback handler. Returns NULL if no prior callback
+handler was set or the callback type was unknown.
+.SH SEE ALSO
+.BR libssh2_session_callback_set2(3)
+.BR libssh2_session_init_ex(3)
+.BR libssh2_agent_sign(3)