Add CloudXR VR streaming support for PICO 4 Ultra (Early Access)

Replaces manual H264/TCP stereo streaming with NVIDIA CloudXR for
higher-quality stereoscopic rendering and lower latency.

Changes:
- teleop_xr_agent.py: add --cloudxr flag (enables Isaac Sim XR mode,
  disables manual StreamingManager)
- deps/cloudxr/: NVIDIA CloudXR.js SDK (Early Access) with Isaac Lab
  teleop React web client
- deps/cloudxr/Dockerfile.wss.proxy: HAProxy WSS proxy for PICO 4 Ultra
  HTTPS mode (routes wss://48322 → ws://49100)
- deps/cloudxr/isaac/webpack.dev.js: disable file watching to avoid
  EMFILE errors with large node_modules
- deps/cloudxr/INSTALL.md: full setup guide

Usage:
  # Start CloudXR Runtime + Isaac Lab
  cd ~/IsaacLab && ./docker/container.py start \
      --files docker-compose.cloudxr-runtime.patch.yaml \
      --env-file .env.cloudxr-runtime

  # Run teleop with CloudXR
  ~/IsaacLab/isaaclab.sh -p teleop_xr_agent.py \
      --task Isaac-MindRobot-2i-DualArm-IK-Abs-v0 --cloudxr

  # Serve web client
  cd deps/cloudxr/isaac && npm run dev-server:https

deps/cloudxr/simple/README.md

@@ -0,0 +1,118 @@
+# CloudXR.js Simple Example
+
+A minimal WebGL example demonstrating WebXR streaming from a CloudXR server to a web browser. This example shows how to integrate WebXR with CloudXR to stream immersive VR/AR content.
+
+> **Note:** This example is for learning purposes, not production use.
+
+## Quick Start
+
+### Prerequisites
+- Node.js (v20 or higher)
+
+### Installation
+
+1. **Navigate to the example folder**
+   ```bash
+   cd simple
+   ```
+
+2. **Install Dependencies**
+   ```bash
+   # For this early access release, please run the following to install SDK from the given tarball. This step will not be needed when SDK is publicly accessible.
+   npm install ../nvidia-cloudxr-6.0.0-beta.tgz
+
+   npm install
+   ```
+
+3. **Build the Application**
+   ```bash
+   npm run build
+   ```
+
+4. **Start Development Server**
+   ```bash
+   npm run dev-server
+   ```
+
+5. **Open in Browser**
+   - Navigate to `http://localhost:8080` (or the port shown in terminal)
+   - For desktop browsers, IWER (Immersive Web Emulator Runtime) will automatically load to emulate a Meta Quest 3 headset
+
+### Basic Usage
+
+1. **Configure Connection**
+   - Enter CloudXR server IP address (default: localhost)
+   - Set port (default: 49100)
+   - Select AR or VR mode
+
+2. **Adjust Settings (Optional)**
+   - Per-eye resolution (must be multiples of 16)
+   - Target frame rate (72, 90, or 120 FPS)
+   - Streaming bitrate
+   - XR reference space and camera offsets
+
+3. **Start Streaming**
+   - Click "CONNECT"
+   - Grant XR permissions when prompted
+
+**Requirements:**
+- CloudXR server running and accessible
+- WebXR-compatible device (VR/AR headset) or desktop browser (IWER loads automatically for emulation)
+
+## Architecture
+
+### CloudXRClient Class
+
+The main application class (`CloudXRClient` in `main.ts`) handles:
+
+**Initialization:**
+- UI element management and localStorage persistence
+- Browser capability checks (WebXR, WebGL2, WebRTC)
+- Event listener setup
+
+**Connection Flow:**
+1. **WebGL Setup** - Creates high-performance WebGL2 context
+2. **WebXR Session** - Enters immersive VR/AR mode
+3. **Reference Space** - Configures coordinate system for tracking
+4. **CloudXR Session** - Establishes streaming connection to server
+5. **Render Loop** - Sends tracking data, receives video, renders frames
+
+**Key Components:**
+- **WebXR Session** - Hardware access (headset, controllers)
+- **WebGL Context** - Video rendering
+- **CloudXR Session** - Streaming management (WebRTC-based)
+- **XRWebGLLayer** - Bridge between WebXR and WebGL
+
+## Project Structure
+
+```
+simple/
+├── src/
+│   └── main.ts          # Main application sample
+├── index.html           # UI and form elements sample
+├── package.json         # Dependencies and scripts
+├── webpack.common.js    # Webpack base configuration sample
+├── webpack.dev.js       # Development configuration sample
+├── webpack.prod.js      # Production configuration sample
+└── tsconfig.json        # TypeScript configuration sample
+```
+
+## Code Overview
+
+The `main.ts` file contains well-commented code explaining each step:
+
+1. **Browser Checks** - Validates WebXR, WebGL2, and WebRTC support
+2. **Connection Setup** - Reads form inputs and validates configuration
+3. **WebGL Initialization** - Creates optimized rendering context
+4. **WebXR Session** - Enters immersive mode with requested features
+5. **CloudXR Setup** - Configures streaming session with event handlers
+6. **Render Loop** - Runs 72-120 times per second:
+   - Sends tracking data to server
+   - Receives video frame
+   - Renders to display
+
+Each method includes inline comments explaining the purpose and key concepts.
+
+## License
+
+See the [LICENSE](LICENSE) file for details.