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/Platform/UIKit/TerminalStickyModifierState.swift

@@ -0,0 +1,81 @@
+//
+//  TerminalStickyModifierState.swift
+//  libghostty-spm
+//
+
+#if canImport(UIKit) && !targetEnvironment(macCatalyst)
+    import Foundation
+
+    @MainActor
+    final class TerminalStickyModifierState {
+        enum Activation { case inactive, armed, locked }
+        enum Modifier { case ctrl, alt, command }
+
+        private(set) var ctrl: Activation = .inactive
+        private(set) var alt: Activation = .inactive
+        private(set) var command: Activation = .inactive
+
+        var onChange: (() -> Void)?
+
+        private var lastCtrlTap: Date = .distantPast
+        private var lastAltTap: Date = .distantPast
+        private var lastCommandTap: Date = .distantPast
+        private let doubleTapInterval: TimeInterval = 0.3
+
+        func toggle(_ modifier: Modifier) {
+            switch modifier {
+            case .ctrl:
+                ctrl = nextActivation(ctrl, lastTap: lastCtrlTap)
+                lastCtrlTap = Date()
+            case .alt:
+                alt = nextActivation(alt, lastTap: lastAltTap)
+                lastAltTap = Date()
+            case .command:
+                command = nextActivation(command, lastTap: lastCommandTap)
+                lastCommandTap = Date()
+            }
+            onChange?()
+        }
+
+        func consumeForNextKey() -> TerminalInputModifiers {
+            var mods = TerminalInputModifiers()
+            if ctrl != .inactive { mods.insert(.ctrl) }
+            if alt != .inactive { mods.insert(.alt) }
+            if command != .inactive { mods.insert(.super_) }
+            if ctrl == .armed { ctrl = .inactive }
+            if alt == .armed { alt = .inactive }
+            if command == .armed { command = .inactive }
+            onChange?()
+            return mods
+        }
+
+        var hasActiveModifiers: Bool {
+            ctrl != .inactive || alt != .inactive || command != .inactive
+        }
+
+        func reset() {
+            guard hasActiveModifiers else { return }
+            ctrl = .inactive
+            alt = .inactive
+            command = .inactive
+            onChange?()
+        }
+
+        private func nextActivation(
+            _ current: Activation,
+            lastTap: Date
+        ) -> Activation {
+            switch current {
+            case .inactive:
+                return .armed
+            case .armed:
+                if Date().timeIntervalSince(lastTap) < doubleTapInterval {
+                    return .locked
+                }
+                return .inactive
+            case .locked:
+                return .inactive
+            }
+        }
+    }
+#endif