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/libghostty-spm/Sources/ShellCraftKit/Definition/SandboxShell.swift

@@ -0,0 +1,70 @@
+import Foundation
+import GhosttyTerminal
+
+public let defaultSandboxShell = ShellDefinition(
+    prompt: SandboxShellStyle.prompt,
+    welcomeMessage: SandboxShellStyle.welcomeMessage,
+    fallback: { command in
+        "\(SandboxShellStyle.error)\(command)\(SandboxShellStyle.reset): command not found"
+    }
+) {
+    ShellCommand("echo", summary: "Echo text back") { context in
+        .output(context.arguments + "\r\n")
+    }
+    ShellCommand("date", summary: "Show current date/time") { _ in
+        let formatter = DateFormatter()
+        formatter.dateFormat = "EEE MMM dd HH:mm:ss zzz yyyy"
+        return .output(formatter.string(from: Date()) + "\r\n")
+    }
+    ShellCommand("uname", summary: "Show system information") { _ in
+        .output("Darwin ghostty-sandbox host-managed\r\n")
+    }
+    ShellCommand("whoami", summary: "Show current user") { context in
+        .output(context.username + "\r\n")
+    }
+    ShellCommand("env", summary: "Show environment variables") { context in
+        .output("""
+        TERM=xterm-ghostty\r
+        SHELL=/bin/zsh\r
+        USER=\(context.username)\r
+        HOME=/Users/\(context.username)\r
+        LANG=en_US.UTF-8\r
+        TERM_PROGRAM=GhosttyKit\r\n
+        """)
+    }
+    ShellCommand("size", summary: "Show terminal size") { context in
+        let size = context.terminalSize
+        return .output(
+            "columns: \(size.columns), rows: \(size.rows), " +
+                "pixels: \(size.widthPixels)x\(size.heightPixels)\r\n"
+        )
+    }
+    ShellCommand("clear", summary: "Clear the screen") { _ in
+        .clear
+    }
+    ShellCommand("exit", summary: "Exit the terminal") { _ in
+        .exit
+    }
+    ShellCommand("logout", summary: "Exit the terminal") { _ in
+        .exit
+    }
+}
+
+public let sandboxShell = defaultSandboxShell
+
+private enum SandboxShellStyle {
+    static let reset = "\u{1B}[0m"
+    static let accent = "\u{1B}[38;5;110m"
+    static let highlight = "\u{1B}[38;5;221m"
+    static let error = "\u{1B}[38;5;203m"
+    static let emphasis = "\u{1B}[1m"
+
+    static let prompt = "\(accent)sandbox\(reset)@\(highlight)ghostty\(reset) % "
+
+    static let welcomeMessage = """
+    \r\n  \(emphasis)\(accent)GhosttyKit Sandbox Demo\(reset)\r
+    \r\n  This terminal runs inside App Sandbox.\r
+      \(accent)No subprocesses are spawned.\(reset)\r
+      Type '\(highlight)help\(reset)' for available commands.\r\n\r\n
+    """
+}