[DOCS] Update demo.gif with the latest opus model information

Documentation Type

Incorrect/outdated documentation

Documentation Location

https://github.com/anthropics/claude-code/blob/main/demo.gif

Section/Topic

Demo.gif in github

Current Documentation

The demo.gif and README currently display the outdated GIF, which shows usage of the Opus 4.5 model.

What's Wrong or Missing?

The GIF doesn’t show the updated information from the latest Opus 4.6 release.

Suggested Improvement

The demo.gif needs to be updated to include the Opus 4.6 model in the terminal window.

Impact

Low - Minor confusion or inconvenience

Additional Context

_No response_