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/CloudOCRClient.swift

@@ -0,0 +1,19 @@
+import Foundation
+
+struct CloudOCRRequest {
+    let jpegData: Data
+}
+
+struct CloudOCRTextResponse {
+    let markdown: String
+}
+
+protocol CloudOCRClient {
+    func recognizeText(from request: CloudOCRRequest) async throws -> CloudOCRTextResponse?
+}
+
+struct StubCloudOCRClient: CloudOCRClient {
+    func recognizeText(from request: CloudOCRRequest) async throws -> CloudOCRTextResponse? {
+        nil
+    }
+}