feat(ios): add RuView LiDAR frame protocol

integrations/iphone-lidar/native/RuViewLiDAR/RuViewFrame.swift

@@ -0,0 +1,87 @@
+import Foundation
+import simd
+
+struct RuViewLiDARFrame: Codable, Sendable {
+    struct Intrinsics: Codable, Sendable {
+        let fx: Float
+        let fy: Float
+        let cx: Float
+        let cy: Float
+        let imageWidth: Int
+        let imageHeight: Int
+    }
+
+    struct Pose: Codable, Sendable {
+        let matrix: [Float]
+    }
+
+    struct Depth: Codable, Sendable {
+        let width: Int
+        let height: Int
+        let meters: [Float]
+        let confidence: [UInt8]
+    }
+
+    struct Provenance: Codable, Sendable {
+        let sensor: String
+        let source: String
+        let privacyClass: String
+        let sequence: UInt64
+        let timestampNs: UInt64
+        let schema: String
+    }
+
+    let type: String
+    let intrinsics: Intrinsics
+    let pose: Pose
+    let depth: Depth
+    let provenance: Provenance
+
+    init(
+        intrinsics: simd_float3x3,
+        imageResolution: CGSize,
+        cameraTransform: simd_float4x4,
+        depthWidth: Int,
+        depthHeight: Int,
+        depthMeters: [Float],
+        confidence: [UInt8],
+        sequence: UInt64,
+        timestamp: TimeInterval
+    ) {
+        self.type = "ruview.lidar.depth.v1"
+        self.intrinsics = Intrinsics(
+            fx: intrinsics.columns.0.x,
+            fy: intrinsics.columns.1.y,
+            cx: intrinsics.columns.2.x,
+            cy: intrinsics.columns.2.y,
+            imageWidth: Int(imageResolution.width),
+            imageHeight: Int(imageResolution.height)
+        )
+        self.pose = Pose(matrix: cameraTransform.columnMajorArray)
+        self.depth = Depth(
+            width: depthWidth,
+            height: depthHeight,
+            meters: depthMeters,
+            confidence: confidence
+        )
+        self.provenance = Provenance(
+            sensor: "apple-arkit-scene-depth",
+            source: "live",
+            privacyClass: "geometry-only",
+            sequence: sequence,
+            timestampNs: UInt64(max(0, timestamp) * 1_000_000_000),
+            schema: "ruview.lidar.depth.v1"
+        )
+    }
+}
+
+private extension simd_float4x4 {
+    var columnMajorArray: [Float] {
+        [
+            columns.0.x, columns.0.y, columns.0.z, columns.0.w,
+            columns.1.x, columns.1.y, columns.1.z, columns.1.w,
+            columns.2.x, columns.2.y, columns.2.z, columns.2.w,
+            columns.3.x, columns.3.y, columns.3.z, columns.3.w
+        ]
+    }
+}