**Building self-contained web app**

I need to create a single index.html file for a web app using the three.min.js file found in the current directory. I'll start by including it with a script tag. The plan is to implement a full-screen scene featuring a rotating icosahedron, two colored point lights, orbit-style auto-rotation, and a subtle starfield background. I'll ensure the file is written in the /tmp/ws directory using the write tool. Finally, everything will be self-contained without any external resources.**Setting up three.js scene**

The instructions specify that the necessary library files, like three.min.js, are already in the current directory, and I need to load them with a plain script tag. Besides three.min.js, I’ll need to check for any other dependencies. I’m going to create a full-screen renderer using CSS and implement orbit-style auto-rotation, but without relying on OrbitControls. Instead, I’ll rotate the icosahedron and update its animation by manipulating the object's rotation directly. I'll also add two point lights and some ambient lighting for effect.**Creating scene elements**

For the scene, I need to use two colored point lights, so I’ll create two THREE.PointLight instances, setting their color, intensity, and distance to ensure they effectively illuminate the icosahedron's material. I’ll use either a phong or standard material for the icosahedron so it reacts to the lights. Plus, I’ll make a starfield background with small points using a white color. The renderer has to fill the entire screen, so I’ll ensure the DOM element is sized accordingly. I'll also remember to handle resizing properly!**Ensuring no external resources**

I need to stick to the requirement of no external resources, so I'll include styles within the style tag. I’ll create a `<div id="scene-container"></div>` and apply CSS to make the canvas fill the entire screen using fixed positioning. I'll ensure the index.html file is present by crafting the necessary code. 

In the head section, I will include the three.min.js file. Since OrbitControls isn't provided, I'll implement a custom orbit by rotating the camera around the Y-axis and adjusting the angle over time.**Finalizing index.html**

I need to create a scene, camera, and renderer for my three.js project. The scene will have a black background, and I'll set up a starfield with 1,200 stars using a buffer geometry. I’ll also add an icosahedron with standard materials that need lighting, so I'll use two point lights and optional ambient light.

The camera will orbit around, and I’ll animate it while ensuring the canvas fills the window. I’ll also handle resizing and ensure everything is contained within the index.html file as required. Let's craft this code!**Creating index.html**

I need to ensure that I'm loading any libraries using a plain `<script src="NAME"></script>`, and I already have three.min.js ready. The starfield will use Points with a uniform sphere distribution. I’ll set up two colored point lights—one red and one blue—while ensuring the canvas fills the screen with no margin.

To achieve this, I’ll set the body and html height to 100%, and use CSS to ensure they cover the full viewport. I'll also include a resize handler to keep everything looking good. Now, I’ll generate the index.html content as a single string, ensuring there are no external resources, and write it to the file!

**Providing customization guidance**

I'm thinking about how to customize colors or rotation speeds since the user asked to build something. I can confirm that we've created index.html in /tmp/ws. I should provide a brief checklist of features and how to customize them without overwhelming details. 

I’ll mention:  
- Open index.html in the browser or run it with a static server.  
- Features include a fullscreen canvas, rotating icosahedron, and a starfield.  
- Customization tips for size, starfield count, camera radius, and rotation speeds.  

If they want more features, I'm here to help!