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/os400/config400.default

@@ -0,0 +1,28 @@
+#!/bin/sh
+# Copyright (C) The libssh2 project and its contributors.
+# SPDX-License-Identifier: BSD-3-Clause
+
+################################################################################
+
+#                       Tunable configuration parameters.
+
+setenv TARGETLIB        'LIBSSH2'               # Target OS/400 program library.
+setenv STATBNDDIR       'LIBSSH2_A'             # Static binding directory.
+setenv DYNBNDDIR        'LIBSSH2'               # Dynamic binding directory.
+setenv SRVPGM           "LIBSSH2.${SONAME}"     # Service program.
+setenv TGTCCSID         '500'                   # Target CCSID of objects.
+setenv DEBUG            '*ALL'                  # Debug level.
+setenv OPTIMIZE         '10'                    # Optimisation level
+setenv OUTPUT           '*NONE'                 # Compilation output option.
+setenv TGTRLS           '*CURRENT'              # Target OS release.
+setenv IFSDIR           '/libssh2'              # Installation IFS directory.
+setenv QADRTDIR         '/QIBM/ProdData/qadrt'  # QADRT IFS directory.
+
+setenv WITH_MD5         'yes'                   # enable MD5 support.
+
+#       Define ZLIB availability and locations.
+
+setenv WITH_ZLIB        0                       # Define to 1 to enable.
+setenv ZLIB_INCLUDE     '/zlib/include'         # ZLIB include IFS directory.
+setenv ZLIB_LIB         'ZLIB'                  # ZLIB library.
+setenv ZLIB_BNDDIR      'ZLIB_A'                # ZLIB binding directory.