Add scan flow MVP and local Axiom skill workspace

This snapshot establishes the camera-to-result recognition flow and related tests while checking in the project skill/docs assets required for the configured local tooling.

StackDex/Services/NetworkMonitor.swift

@@ -0,0 +1,37 @@
+import Combine
+import Foundation
+import Network
+
+protocol NetworkStatusProviding: AnyObject {
+    var isOnline: Bool { get }
+    func startMonitoring()
+    func stopMonitoring()
+}
+
+@MainActor
+final class NetworkMonitor: ObservableObject, NetworkStatusProviding {
+    @Published private(set) var isOnline = true
+
+    private let monitor = NWPathMonitor()
+    private let queue = DispatchQueue(label: "StackDex.NetworkMonitor")
+    private var isMonitoring = false
+
+    func startMonitoring() {
+        guard !isMonitoring else { return }
+        isMonitoring = true
+
+        monitor.pathUpdateHandler = { [weak self] path in
+            let isSatisfied = path.status == .satisfied
+            DispatchQueue.main.async {
+                self?.isOnline = isSatisfied
+            }
+        }
+        monitor.start(queue: queue)
+    }
+
+    func stopMonitoring() {
+        guard isMonitoring else { return }
+        monitor.cancel()
+        isMonitoring = false
+    }
+}