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/tests/ossfuzz/ssh2_client_fuzzer.cc

@@ -0,0 +1,97 @@
+/* Copyright (C) The libssh2 project and its contributors.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <assert.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <libssh2.h>
+#include "testinput.h"
+
+#define FUZZ_ASSERT(COND)                                                     \
+    if(!(COND))                                                               \
+    {                                                                         \
+      fprintf(stderr, "Assertion failed: " #COND "\n%s",                      \
+              strerror(errno));                                               \
+      assert((COND));                                                         \
+    }
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+  int socket_fds[2] = {-1, -1};
+  ssize_t written;
+  int rc;
+  LIBSSH2_SESSION *session = NULL;
+  int handshake_completed = 0;
+
+  rc = libssh2_init(0);
+
+  if(rc) {
+    fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);
+    goto EXIT_LABEL;
+  }
+
+  // Create a socket pair so data can be sent in.
+  rc = socketpair(AF_UNIX, SOCK_STREAM, 0, socket_fds);
+  FUZZ_ASSERT(rc == 0);
+
+  written = send(socket_fds[1], data, size, 0);
+
+  if(written != size)
+  {
+    // Handle whatever error case we're in.
+    fprintf(stderr, "send() of %zu bytes returned %zu (%d)\n",
+            size,
+            written,
+            errno);
+    goto EXIT_LABEL;
+  }
+
+  rc = shutdown(socket_fds[1], SHUT_WR);
+  if(rc)
+  {
+    fprintf(stderr, "socket shutdown failed (%d)\n", rc);
+    goto EXIT_LABEL;
+  }
+
+  // Create a session and start the handshake using the fuzz data passed in.
+  session = libssh2_session_init();
+  if(session) {
+    libssh2_session_set_blocking(session, 1);
+  }
+  else {
+    goto EXIT_LABEL;
+  }
+
+  if(libssh2_session_handshake(session, socket_fds[0])) {
+    goto EXIT_LABEL;
+  }
+
+  // If we get here the handshake actually completed.
+  handshake_completed = 1;
+
+EXIT_LABEL:
+
+  if(session)
+  {
+    if(handshake_completed)
+    {
+      libssh2_session_disconnect(session,
+                                 "Normal Shutdown, Thank you for playing");
+    }
+
+    libssh2_session_free(session);
+  }
+
+  libssh2_exit();
+
+  close(socket_fds[0]);
+  close(socket_fds[1]);
+
+  return 0;
+}