Summary: Cursor updates AI agent demo with GPT-5.2

Why It Matters: The update showcases more advanced AI capabilities in the product demo, specifically highlighting a newer model version (GPT-5.2) and more complex multi-file coding tasks.

What Changed:

• Updated the interactive demo text to reference "GPT-5.2" instead of "GPT-5."
• Expanded the PyTorch MNIST demo code to include a new command-line runner script (run_experiment.py).
• Added more detail to the agent's completed task list, specifically mentioning YAML configs and confusion matrices.
• Updated the copyright year in the footer from 2025 to 2026.
• Modified the "Complete codebase understanding" section to show a new search query example about model picker UI implementation.