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/GhosttyTerminal/Surface/TerminalSurfaceOptions.swift

@@ -0,0 +1,48 @@
+//
+//  TerminalSurfaceOptions.swift
+//  libghostty-spm
+//
+//  Created by Lakr233 on 2026/3/16.
+//
+
+import GhosttyKit
+
+public struct TerminalSurfaceOptions: Sendable {
+    public var backend: TerminalSessionBackend
+    public var fontSize: Float?
+    public var workingDirectory: String?
+    /// Extra environment variables set in the child process spawned for this
+    /// surface (exec backend). Passed through `ghostty_surface_config_s.env_vars`;
+    /// every process launched from the surface's shell inherits them, which lets
+    /// embedding hosts tag a surface (e.g. `MYAPP_PANE=<uuid>`) and correlate
+    /// externally observed processes back to it.
+    public var envVars: [String: String]
+    public var context: TerminalSurfaceContext
+
+    public init(
+        backend: TerminalSessionBackend = .exec,
+        fontSize: Float? = nil,
+        workingDirectory: String? = nil,
+        envVars: [String: String] = [:],
+        context: TerminalSurfaceContext = .window
+    ) {
+        self.backend = backend
+        self.fontSize = fontSize
+        self.workingDirectory = workingDirectory
+        self.envVars = envVars
+        self.context = context
+    }
+
+    func isEquivalent(to other: TerminalSurfaceOptions) -> Bool {
+        fontSize == other.fontSize
+            && workingDirectory == other.workingDirectory
+            && envVars == other.envVars
+            && context == other.context
+            && backend.isEquivalent(to: other.backend)
+    }
+
+    var inMemorySession: InMemoryTerminalSession? {
+        guard case let .inMemory(session) = backend else { return nil }
+        return session
+    }
+}