add MosisPointerComponent VR interaction documentation

CLAUDE.md

@@ -626,6 +626,92 @@ rmdir /s /q "Binaries"
 - Android Build Tools 36.1.0 (for AIDL compiler)
 - `ANDROID_HOME` environment variable set
 
+#### VR Pointer Interaction
+
+The MosisSDK includes `UMosisPointerComponent` for VR ray-based touch interaction.
+
+**Key Files**:
+- `Public/MosisPointerComponent.h` - Component header
+- `Private/MosisPointerComponent.cpp` - Implementation
+
+**Features**:
+- Raycast from component transform (attach as child of motion controller)
+- Automatic detection of `AMosisPhoneActor` hits
+- Touch state machine: Down/Move/Up events
+- Optional Enhanced Input binding via `TriggerAction` property
+- Manual control via `SetTriggerPressed(bool)`
+- Debug ray visualization
+
+**Blueprint Setup**:
+1. Add `MosisPointerComponent` as child of `MotionControllerComponent`
+2. Set `TriggerAction` to your trigger input action (optional)
+3. Touch events are sent automatically when pointing at phone and triggering
+
+**C++ Setup**:
+```cpp
+// In VR Pawn header
+UPROPERTY(VisibleAnywhere)
+UMosisPointerComponent* RightPointer;
+
+// In constructor
+RightPointer = CreateDefaultSubobject<UMosisPointerComponent>(TEXT("RightPointer"));
+RightPointer->SetupAttachment(RightMotionController);
+
+// In BeginPlay (if using Enhanced Input)
+RightPointer->TriggerAction = TriggerInputAction;
+```
+
+**Manual Control (without Enhanced Input)**:
+```cpp
+// In your input handling code
+void AMyVRPawn::OnTriggerPressed()
+{
+    RightPointer->SetTriggerPressed(true);
+}
+
+void AMyVRPawn::OnTriggerReleased()
+{
+    RightPointer->SetTriggerPressed(false);
+}
+```
+
+**Component Properties**:
+
+| Property | Type | Default | Description |
+|----------|------|---------|-------------|
+| `RayLength` | float | 500.0 | Maximum ray length in cm |
+| `bShowDebugRay` | bool | false | Draw debug visualization |
+| `DebugRayColor` | FLinearColor | Red | Ray color when not hitting |
+| `DebugRayHitColor` | FLinearColor | Green | Ray color when hitting phone |
+| `TraceChannel` | ECollisionChannel | Visibility | Collision channel for raycast |
+| `TriggerAction` | UInputAction* | nullptr | Enhanced Input action for trigger |
+
+**Blueprint Functions**:
+
+| Function | Returns | Description |
+|----------|---------|-------------|
+| `IsPointingAtPhone()` | bool | True if ray hits a phone actor |
+| `GetTargetPhone()` | AMosisPhoneActor* | Currently targeted phone (or nullptr) |
+| `GetHitLocation()` | FVector | World location of ray hit |
+| `GetRayOrigin()` | FVector | Ray start position |
+| `GetRayDirection()` | FVector | Ray direction vector |
+| `IsTriggerPressed()` | bool | Current trigger state |
+| `SetTriggerPressed(bool)` | void | Manual trigger control |
+
+**Touch State Machine**:
+```
+Idle ──[raycast hit]──► Hover ──[trigger]──► Pressed
+  ▲                       │                      │
+  │                       │ raycast miss         │ trigger release
+  │                       ▼                      ▼
+  └──────────────────── Idle ◄────────────────────
+
+Events:
+- Idle → Pressed: SendTouch(Down)
+- Pressed + moving: SendTouch(Move)
+- Pressed → Idle: SendTouch(Up)
+```
+
 ### MosisVR (Unity 6000.3.2f1)
 
 **Location**: `D:\Dev\Mosis\MosisVR\Packages\com.omixlab.mosis_sdk\`