refactor: migrate iOS gateway to unified ws

apps/ios/Tests/IOSGatewayChatTransportTests.swift

@@ -0,0 +1,30 @@
+import ClawdbotKit
+import Testing
+@testable import Clawdbot
+
+@Suite struct IOSGatewayChatTransportTests {
+    @Test func requestsFailFastWhenGatewayNotConnected() async {
+        let gateway = GatewayNodeSession()
+        let transport = IOSGatewayChatTransport(gateway: gateway)
+
+        do {
+            _ = try await transport.requestHistory(sessionKey: "node-test")
+            Issue.record("Expected requestHistory to throw when gateway not connected")
+        } catch {}
+
+        do {
+            _ = try await transport.sendMessage(
+                sessionKey: "node-test",
+                message: "hello",
+                thinking: "low",
+                idempotencyKey: "idempotency",
+                attachments: [])
+            Issue.record("Expected sendMessage to throw when gateway not connected")
+        } catch {}
+
+        do {
+            _ = try await transport.requestHealth(timeoutMs: 250)
+            Issue.record("Expected requestHealth to throw when gateway not connected")
+        } catch {}
+    }
+}