Summary: Cursor adds new coding model and agent interface

Why It Matters: This change shows Cursor is making big updates to how people code with AI. They are adding new tools and ways to work.

What Changed:

• The code example for train_model.py was greatly expanded and updated to include more advanced features like mixed precision training, validation splitting, and configuration management.
• New text was added to describe the updates to the PyTorch MNIST Experiments, including details about training and experimentation features.
• A new changelog entry for "2.0 Oct 29, 2025 New Coding Model and Agent Interface" was added.
• A new blog post entry "Introducing Cursor 2.0 and Composer A new interface and our first coding model, both purpose-built for working with agents. product·Oct 29, 2025" was added.
• The "Complete codebase understanding" section now includes "Choose a model * Searching" in its example.