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_supported_algs.3

@@ -0,0 +1,79 @@
+.\" Copyright (C) The libssh2 project and its contributors.
+.\" SPDX-License-Identifier: BSD-3-Clause
+.TH libssh2_session_supported_algs 3 "23 Oct 2011" "libssh2" "libssh2"
+.SH NAME
+libssh2_session_supported_algs - get list of supported algorithms
+.SH SYNOPSIS
+.nf
+#include <libssh2.h>
+
+int
+libssh2_session_supported_algs(LIBSSH2_SESSION* session,
+                               int method_type,
+                               const char*** algs);
+.fi
+.SH DESCRIPTION
+\fIsession\fP - An instance of initialized LIBSSH2_SESSION (the function will
+use its pointer to the memory allocation function). \fImethod_type\fP -
+Method type. See \fIlibssh2_session_method_pref(3)\fP. \fIalgs\fP - Address
+of a pointer that will point to an array of returned algorithms
+
+Get a list of supported algorithms for the given \fImethod_type\fP. The
+method_type parameter is equivalent to method_type in
+\fIlibssh2_session_method_pref(3)\fP. If successful, the function will
+allocate the appropriate amount of memory. When not needed anymore, it must be
+deallocated by calling \fIlibssh2_free(3)\fP. When this function is
+unsuccessful, this must not be done.
+
+In order to get a list of all supported compression algorithms,
+libssh2_session_flag(session, LIBSSH2_FLAG_COMPRESS, 1) must be called before
+calling this function, otherwise only "none" will be returned.
+
+If successful, the function will allocate and fill the array with supported
+algorithms (the same names as defined in RFC 4253). The array is not NULL
+terminated.
+.SH EXAMPLE
+.nf
+#include "libssh2.h"
+
+const char **algorithms;
+int rc, i;
+LIBSSH2_SESSION *session;
+
+/* initialize session */
+session = libssh2_session_init();
+rc = libssh2_session_supported_algs(session,
+                                    LIBSSH2_METHOD_CRYPT_CS,
+                                    &algorithms);
+if(rc > 0) {
+    /* the call succeeded, do sth. with the list of algorithms
+       (e.g. list them)... */
+    printf("Supported symmetric algorithms:\\n");
+    for(i = 0; i < rc; i++)
+        printf("\\t%s\\n", algorithms[i]);
+
+    /* ... and free the allocated memory when not needed anymore */
+    libssh2_free(session, algorithms);
+}
+else {
+    /* call failed, error handling */
+}
+.fi
+.SH RETURN VALUE
+On success, a number of returned algorithms (i.e a positive number will be
+returned). In case of a failure, an error code (a negative number, see below)
+is returned. 0 should never be returned.
+.SH ERRORS
+\fILIBSSH2_ERROR_BAD_USE\fP - Invalid address of algs.
+
+\fILIBSSH2_ERROR_METHOD_NOT_SUPPORTED\fP - Unknown method type.
+
+\fILIBSSH2_ERROR_INVAL\fP - Internal error (normally should not occur).
+
+\fILIBSSH2_ERROR_ALLOC\fP - Allocation of memory failed.
+.SH AVAILABILITY
+Added in 1.4.0
+.SH SEE ALSO
+.BR libssh2_session_methods(3),
+.BR libssh2_session_method_pref(3)
+.BR libssh2_free(3)