feat(ios): W4 app wiring — DI graph, event fan-out, lifecycle, privacy shade

T-iOS-15: AppEnvironment production DI (real Keychain/probe/transports), EventFanOut
(engine.events → TerminalVM + GateVM + activity bridge), scenePhase lifecycle
(.background→close, suspend→rebuild+reopen reclaims size), privacy shade on != .active,
spike screen deleted, cold-start routing
Walkthrough proxies: hosted live-server smoke over the production DI graph (probe→store→
attach→echo→close) + real-Keychain kSecAttrAccessible assertion (closes T-iOS-7 deferral)
Deviation closed: TerminalViewModel.lastSentDims (valid-only) + alive-engine .active →
notifyForegrounded(dims:) (orchestrator fix on behalf of T-iOS-11 owner)
Env finding: repo under ~/Documents → TCC blocks sim-spawned node; SimServerHarness dual-mode
(self-bootstrap / WEBTERM_SERVER_URL via simctl launchctl setenv)
Verified: 214 pkg + 76 app + 10 integration tests green; verify agent 8/8 PASS

ios/App/WebTerm/Screens/SpikeTerminalScreen.swift

@@ -1,89 +0,0 @@
-//
-// SpikeTerminalScreen.swift — T-iOS-2 Day-1 spike ②【临时文件，W4/T-iOS-15 删除】
-//
-// 目的：SwiftTerm TerminalView 的真机键盘/IME smoke 载体（plan §7 T-iOS-2）：
-//   - 键盘弹出 / first-responder 行为
-//   - 中文 IME 组合输入（不自加 keydown 监听，组合事件全交系统栈）
-//   - inputAccessoryView 上 Esc/Ctrl-C 可发 —— SwiftTerm iOS 端自带
-//     TerminalAccessory（含 esc/ctrl/tab 键，iOSAccessoryView.swift），
-//     spike 直接用它验证；正式 key-bar（逐字节复刻 public/keybar.ts）归 T-iOS-11
-//   - 文本选择不崩（SwiftTerm 自绘选择是历史坑点）
-//
-// 接线为【纯本地回显】（无服务器依赖）：typed bytes → send() → feed() 原样喂回，
-// CR 扩成 CRLF。真实 SessionEngine 接线是 W2/W3 的事。
-//
-// 2026-07-04：无可用真机 —— 真机清单各项记 DEFERRED(真机不可用)（见 PROGRESS_LOG
-// 条目）。本文件当下的验收是：作为 App target 源码在模拟器 xcodebuild 构建通过。
-
-import SwiftTerm
-import SwiftUI
-
-/// Day-1 spike 的最小 SwiftUI 壳。不接入 WebTermApp 导航（WebTermApp.swift 归
-/// T-iOS-1/T-iOS-15 所有）；存在本身即证明 App target 在 Swift 6 strict
-/// concurrency 下能链接并承载 SwiftTerm 的 TerminalView。
-struct SpikeTerminalScreen: View {
-    var body: some View {
-        LocalEchoTerminal()
-            .ignoresSafeArea(.container, edges: .bottom)
-            .navigationTitle("SwiftTerm spike")
-    }
-}
-
-/// 承载 SwiftTerm UIKit `TerminalView` 的 UIViewRepresentable，接本地回显。
-/// 形状即 T-iOS-11 正式 TerminalScreen 的雏形（去掉 SessionEngine）。
-private struct LocalEchoTerminal: UIViewRepresentable {
-    func makeCoordinator() -> LocalEchoCoordinator {
-        LocalEchoCoordinator()
-    }
-
-    func makeUIView(context: Context) -> TerminalView {
-        let view = TerminalView(frame: .zero)
-        view.terminalDelegate = context.coordinator
-        view.feed(text: SpikeGreeting.text)
-        return view
-    }
-
-    func updateUIView(_ uiView: TerminalView, context: Context) {
-        // 本地回显无外部状态可同步。
-    }
-}
-
-private enum SpikeGreeting {
-    /// 行尾用 CRLF：PTY 语义下裸 LF 只下移一行不回车。
-    static let text = "SwiftTerm local-echo spike (T-iOS-2)\r\n"
-        + "Typed bytes are echoed locally; CR -> CRLF.\r\n"
-        + "真机清单: 键盘弹出 / 中文 IME / accessory esc·ctrl / 文本选择\r\n\r\n> "
-}
-
-/// 本地回显 delegate：SwiftTerm 要"发给宿主"的每个字节原样喂回终端。
-/// Enter 产生的 CR（0x0D）补一个 LF，光标才会回行首并换行。
-@MainActor
-private final class LocalEchoCoordinator: NSObject, @preconcurrency TerminalViewDelegate {
-    private static let carriageReturn: UInt8 = 0x0D
-    private static let lineFeed: UInt8 = 0x0A
-
-    func send(source: TerminalView, data: ArraySlice<UInt8>) {
-        var echoed: [UInt8] = []
-        echoed.reserveCapacity(data.count + 1)
-        for byte in data {
-            echoed.append(byte)
-            if byte == Self.carriageReturn {
-                echoed.append(Self.lineFeed)
-            }
-        }
-        source.feed(byteArray: echoed[...])
-    }
-
-    func sizeChanged(source: TerminalView, newCols: Int, newRows: Int) {}
-    func setTerminalTitle(source: TerminalView, title: String) {}
-    func hostCurrentDirectoryUpdate(source: TerminalView, directory: String?) {}
-    func scrolled(source: TerminalView, position: Double) {}
-    func requestOpenLink(source: TerminalView, link: String, params: [String: String]) {}
-    func clipboardCopy(source: TerminalView, content: Data) {}
-    func rangeChanged(source: TerminalView, startY: Int, endY: Int) {}
-    // bell / iTermContent 用 SwiftTerm 的默认实现。
-}
-
-#Preview {
-    SpikeTerminalScreen()
-}