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_open_ex.3

@@ -0,0 +1,58 @@
+.\" Copyright (C) The libssh2 project and its contributors.
+.\" SPDX-License-Identifier: BSD-3-Clause
+.TH libssh2_channel_open_ex 3 "1 Jun 2007" "libssh2 0.15" "libssh2"
+.SH NAME
+libssh2_channel_open_ex - establish a generic session channel
+.SH SYNOPSIS
+.nf
+#include <libssh2.h>
+
+LIBSSH2_CHANNEL *
+libssh2_channel_open_ex(LIBSSH2_SESSION *session, const char *channel_type,
+                        unsigned int channel_type_len,
+                        unsigned int window_size,
+                        unsigned int packet_size,
+                        const char *message, unsigned int message_len);
+
+LIBSSH2_CHANNEL *
+libssh2_channel_open_session(session);
+.fi
+.SH DESCRIPTION
+\fIsession\fP - Session instance as returned by
+.BR libssh2_session_init_ex(3)
+
+\fIchannel_type\fP - Channel type to open. Typically one of session,
+direct-tcpip, or tcpip-forward. The SSH2 protocol allowed for additional
+types including local, custom channel types.
+
+\fIchannel_type_len\fP - Length of channel_type
+
+\fIwindow_size\fP - Maximum amount of unacknowledged data remote host is
+allowed to send before receiving an SSH_MSG_CHANNEL_WINDOW_ADJUST packet.
+
+\fIpacket_size\fP - Maximum number of bytes remote host is allowed to send
+in a single SSH_MSG_CHANNEL_DATA or SSG_MSG_CHANNEL_EXTENDED_DATA packet.
+
+\fImessage\fP - Additional data as required by the selected channel_type.
+
+\fImessage_len\fP - Length of message parameter.
+
+Allocate a new channel for exchanging data with the server. This method is
+typically called through its macroized form:
+.BR libssh2_channel_open_session(3)
+or via
+.BR libssh2_channel_direct_tcpip(3)
+or
+.BR libssh2_channel_forward_listen(3)
+.SH RETURN VALUE
+Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors.
+.SH ERRORS
+\fILIBSSH2_ERROR_ALLOC\fP - An internal memory allocation call failed.
+
+\fILIBSSH2_ERROR_SOCKET_SEND\fP - Unable to send data on socket.
+
+\fILIBSSH2_ERROR_CHANNEL_FAILURE\fP -
+
+\fILIBSSH2_ERROR_EAGAIN\fP - Marked for non-blocking I/O but the call would block.
+.SH SEE ALSO
+Add related functions