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_channel_get_exit_signal.3

@@ -0,0 +1,39 @@
+.\" Copyright (C) The libssh2 project and its contributors.
+.\" SPDX-License-Identifier: BSD-3-Clause
+.TH libssh2_channel_get_exit_signal 3 "4 Oct 2010" "libssh2 1.2.8" "libssh2"
+.SH NAME
+libssh2_channel_get_exit_signal - get the remote exit signal
+.SH SYNOPSIS
+.nf
+#include <libssh2.h>
+
+int
+libssh2_channel_get_exit_signal(LIBSSH2_CHANNEL *channel,
+                                char **exitsignal, size_t *exitsignal_len,
+                                char **errmsg, size_t *errmsg_len,
+                                char **langtag, size_t *langtag_len);
+.fi
+.SH DESCRIPTION
+\fIchannel\fP - Closed channel stream to retrieve exit signal from.
+
+\fIexitsignal\fP - If not NULL, is populated by reference with the exit signal
+(without leading "SIG"). Note that the string is stored in a newly allocated
+buffer. If the remote program exited cleanly, the referenced string pointer
+will be set to NULL.
+
+\fIexitsignal_len\fP - If not NULL, is populated by reference with the length
+of exitsignal.
+
+\fIerrmsg\fP - If not NULL, is populated by reference with the error message
+(if provided by remote server, if not it will be set to NULL). Note that the
+string is stored in a newly allocated buffer.
+
+\fIerrmsg_len\fP - If not NULL, is populated by reference with the length of errmsg.
+
+\fIlangtag\fP - If not NULL, is populated by reference with the language tag
+(if provided by remote server, if not it will be set to NULL). Note that the
+string is stored in a newly allocated buffer.
+
+\fIlangtag_len\fP - If not NULL, is populated by reference with the length of langtag.
+.SH RETURN VALUE
+Numeric error code corresponding to the the Error Code constants.