feat(ios): W0 scaffold + day-1 spike + WireProtocol frozen contract + TestSupport doubles

T-iOS-1: ios/ XcodeGen project (iOS 17, Swift 6 strict concurrency, ATS per PLAN §5.2), 5 SPM package shells, CI skeleton
T-iOS-2: Origin spike vs real server — URLSessionWebSocketTask custom Origin CONFIRMED (no Starscream); 16MiB replay + EMSGSIZE(40) errno correction written back to plan
T-iOS-3: WireProtocol frozen contract, 59 tests, 100% line coverage, cross-impl vectors vs src/protocol.ts via tsx
T-iOS-4: FakeTransport/FakeClock/FakeHTTPTransport doubles
Verify: independent agent re-ran all acceptance — 6/6 PASS

ios/Packages/WireProtocol/Tests/WireProtocolTests/ContractConstantsTests.swift

@@ -0,0 +1,79 @@
+import Foundation
+import Testing
+import WireProtocol
+
+// T-iOS-3 · 冻结契约常量绊线：Tunables（§3.2.1 唯一取值表）与 WireConstants。
+// 这些断言故意逐字重复取值表——改常量必须回 T-iOS-3 改契约并同步这里。
+
+@Test("Tunables 取值与 §3.2.1 表逐项一致")
+func tunablesMatchFrozenValueTable() {
+    #expect(Tunables.pingInterval == .seconds(25))
+    #expect(Tunables.pongMissLimit == 2)
+    #expect(Tunables.listPollInterval == .seconds(5)) // public/launcher.ts:30 REFRESH_MS
+    #expect(Tunables.telemetryStaleTtlMs == 30_000) // public/tabs.ts:45 STATUSLINE_TTL_MS
+    #expect(Tunables.digestFadeDelay == .seconds(8))
+    #expect(Tunables.titleMaxLength == 256)
+    #expect(Tunables.maxWSMessageBytes == 16 * 1024 * 1024)
+}
+
+@Test("maxWSMessageBytes ≥ 6 × 默认 SCROLLBACK_BYTES(2MiB)（JSON 转义最坏膨胀系数）")
+func maxWSMessageBytesCoversWorstCaseReplayExpansion() {
+    // Arrange — src/config.ts:39 DEFAULT_SCROLLBACK_BYTES = 2MiB；\uXXXX 转义最坏 6×
+    let defaultScrollbackBytes = 2 * 1024 * 1024
+    let worstCaseEscapeFactor = 6
+
+    // Assert
+    #expect(Tunables.maxWSMessageBytes >= worstCaseEscapeFactor * defaultScrollbackBytes)
+}
+
+@Test("WireConstants：wsPath/soft-reset 前缀/spawn 失败码/resize 区间")
+func wireConstantsMatchServer() {
+    #expect(WireConstants.wsPath == "/term") // src/config.ts:41 DEFAULT_WS_PATH
+    #expect(WireConstants.replaySoftResetPrefix == "\u{1B}[0m") // src/types.ts:167-170
+    #expect(WireConstants.spawnFailedExitCode == -1) // M4
+    #expect(WireConstants.resizeRange == 1...1000) // src/protocol.ts:113-115
+}
+
+@Test("TransportConnection：能力句柄原样保存；frames finish = 干净断线")
+func transportConnectionHoldsCapabilityHandles() async throws {
+    // Arrange
+    actor Recorder {
+        var sentFrames: [String] = []
+        var isClosed = false
+        func recordSend(_ frame: String) { sentFrames.append(frame) }
+        func recordClose() { isClosed = true }
+    }
+    let recorder = Recorder()
+    let connection = TransportConnection(
+        frames: AsyncThrowingStream { continuation in
+            continuation.yield("{\"type\":\"output\",\"data\":\"x\"}")
+            continuation.finish()
+        },
+        send: { await recorder.recordSend($0) },
+        close: { await recorder.recordClose() }
+    )
+
+    // Act
+    var received: [String] = []
+    for try await frame in connection.frames {
+        received.append(frame)
+    }
+    try await connection.send("{\"type\":\"reject\"}")
+    await connection.close()
+
+    // Assert
+    #expect(received == ["{\"type\":\"output\",\"data\":\"x\"}"])
+    #expect(await recorder.sentFrames == ["{\"type\":\"reject\"}"])
+    #expect(await recorder.isClosed)
+}
+
+@Test("ClaudeStatus/GateKind rawValue 与服务器字面量一致")
+func statusAndGateRawValuesMatchServer() {
+    #expect(ClaudeStatus.working.rawValue == "working")
+    #expect(ClaudeStatus.waiting.rawValue == "waiting")
+    #expect(ClaudeStatus.idle.rawValue == "idle")
+    #expect(ClaudeStatus.unknown.rawValue == "unknown")
+    #expect(ClaudeStatus.stuck.rawValue == "stuck")
+    #expect(GateKind.tool.rawValue == "tool")
+    #expect(GateKind.plan.rawValue == "plan")
+}