feat(companion): add generated macos ios android reference app surfaces

apps/companion/ios/CompanionBootstrap.swift

@@ -0,0 +1,32 @@
+import Foundation
+
+// Reference iOS bootstrap model for integrating with Flynn gateway runtime.
+// Wire APNs token refresh to node.push_token.set and app lifecycle to heartbeat publishing.
+
+struct CompanionBootstrap: Codable {
+  let schemaVersion: Int
+  let generatedAt: String
+  let gateway: Gateway
+  let node: Node
+  let runtime: Runtime
+}
+
+struct Gateway: Codable {
+  let url: String
+  let token: String?
+}
+
+struct Node: Codable {
+  let nodeId: String
+  let role: String
+  let platform: String
+  let capabilities: [String]
+}
+
+struct Runtime: Codable {
+  let heartbeatSeconds: Int
+  let handoffTimeoutMs: Int
+  let autoReconnect: Bool
+}
+
+// Generated for node: ios-reference-shell (ios)