[FEATURE] aliases for claude command

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Aliases for claude commands. E.g. "/Thx" for "/exit"

Proposed Solution

Allow command aliases to be added in the claude config.

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

Type /thx and I exit a CLI session with a thank you to claude.

Additional Context

_No response_