[FEATURE] Bring back /simplify

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

Claude Code 2.1.146 removed /simplify and replaced with /code-review which takes absolutely no action and is quite different.

Proposed Solution

Bring back /simplify command

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

1. Before I run a commit I want to run /simplify or after /code-review

Additional Context

_No response_