build: depend on shared AVLiveWire package

Both ARBodyTracker (iOS) and AVLiveBody (macOS) now depend on
the local shared/AVLiveWire package so the wire format is
defined once. iOS USBServer imports it; macOS use lands in
Plan 3.

iphone-arbody/ARBodyTracker.swiftpm/Package.swift

@@ -8,9 +8,15 @@ let package = Package(
     products: [
         .executable(name: "ARBodyTracker", targets: ["ARBodyTracker"]),
     ],
+    dependencies: [
+        .package(path: "../../shared/AVLiveWire"),
+    ],
     targets: [
         .executableTarget(
             name: "ARBodyTracker",
+            dependencies: [
+                .product(name: "AVLiveWire", package: "AVLiveWire"),
+            ],
             path: "Sources/ARBodyTracker"
         ),
     ]

launcher/AV-Live-Body/Package.swift

@@ -4,9 +4,15 @@ import PackageDescription
 let package = Package(
     name: "AVLiveBody",
     platforms: [.macOS(.v15)],
+    dependencies: [
+        .package(path: "../../shared/AVLiveWire"),
+    ],
     targets: [
         .executableTarget(
             name: "AVLiveBody",
+            dependencies: [
+                .product(name: "AVLiveWire", package: "AVLiveWire"),
+            ],
             path: "Sources/AVLiveBody",
             resources: [
                 .copy("Resources/smplx_faces.bin"),