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_read_ex.3

@@ -0,0 +1,50 @@
+.\" Copyright (C) The libssh2 project and its contributors.
+.\" SPDX-License-Identifier: BSD-3-Clause
+.TH libssh2_channel_read_ex 3 "1 Jun 2007" "libssh2 0.15" "libssh2"
+.SH NAME
+libssh2_channel_read_ex - read data from a channel stream
+.SH SYNOPSIS
+.nf
+#include <libssh2.h>
+
+ssize_t
+libssh2_channel_read_ex(LIBSSH2_CHANNEL *channel, int stream_id,
+                        char *buf, size_t buflen);
+
+ssize_t
+libssh2_channel_read(LIBSSH2_CHANNEL *channel,
+                     char *buf, size_t buflen);
+
+ssize_t
+libssh2_channel_read_stderr(LIBSSH2_CHANNEL *channel,
+                            char *buf, size_t buflen);
+.fi
+.SH DESCRIPTION
+Attempt to read data from an active channel stream. All channel streams have
+one standard I/O substream (stream_id == 0), and may have up to 2^32 extended
+data streams as identified by the selected \fIstream_id\fP. The SSH2 protocol
+currently defines a stream ID of 1 to be the stderr substream.
+
+\fIchannel\fP - active channel stream to read from.
+
+\fIstream_id\fP - substream ID number (e.g. 0 or SSH_EXTENDED_DATA_STDERR)
+
+\fIbuf\fP - pointer to storage buffer to read data into
+
+\fIbuflen\fP - size of the buf storage
+
+\fIlibssh2_channel_read(3)\fP and \fIlibssh2_channel_read_stderr(3)\fP are
+macros.
+.SH RETURN VALUE
+Actual number of bytes read or negative on failure. It returns
+LIBSSH2_ERROR_EAGAIN when it would otherwise block. While
+LIBSSH2_ERROR_EAGAIN is a negative number, it is not really a failure per se.
+
+Note that a return value of zero (0) can in fact be a legitimate value and
+only signals that no payload data was read. It is not an error.
+.SH ERRORS
+\fILIBSSH2_ERROR_SOCKET_SEND\fP - Unable to send data on socket.
+
+\fILIBSSH2_ERROR_CHANNEL_CLOSED\fP - The channel has been closed.
+.SH SEE ALSO
+.BR libssh2_poll_channel_read(3)