Remove deprecated user-preferences command

[RIVALHIDE]

What happened?

The user-preferences command is currently present in Cortex, but it is no longer required and does not fit the intended command structure. There is also no dedicated command for creating or tracking user-related issues, which leads to confusion and overlapping functionality.

The intention is to remove the existing user-preferences command and introduce a new issue tracker command that provides a clearer and more maintainable workflow for handling user preference–related issues.

How to reproduce

1. Command run:

   cortex user-preferences
   

2. What you expected
   The command to be deprecated or removed, or to redirect users to a supported issue tracker command.

3. What actually happened
   The user-preferences command is still available and functional, with no clear replacement for issue tracking.

Environment

• OS: Ubuntu 24.04 / Debian 12 / etc.
• Python: 3.11 / 3.12
• LLM Provider: Claude / OpenAI / Ollama

Error output

No explicit error message is shown. The issue is related to outdated and unsupported command behavior.

[Anshgrover23]

Hi @mikejmorgan-ai @Suyashd999 Can I get assigned to this issue ?

[Suyashd999]

Hi @mikejmorgan-ai @Suyashd999 Can I get assigned to this issue ?

done