simplify-code

# Simplify Code Review changed code for reuse, quality, efficiency, and clarity issues. Use Codex sub-agents to review in parallel, then optionally apply only high-confidence, behavior-preserving fixes. ## When to Use - When the user asks to simplify, clean up, refactor, or review changed code. - When you want high-confidence, behavior-preserving improvements on a scoped diff. ## Modes Choose the mode from the user's request: - `review-only`: user asks to review, audit, or check the changes - `safe-fixes`: user asks to simplify, clean up, or refactor the changes - `fix-and-validate`: same as `safe-fixes`, but also run the smallest relevant validation after edits If the user does not specify, default to: - `review-only` for "review", "audit", or "check" - `safe-fixes` for "simplify", "clean up", or "refactor" ## Step 1: Determine the Scope and Diff Command Prefer this scope order: 1. Files or paths explicitly named by the user 2. Current git changes 3. Files edited earlier in the current Codex turn 4. Most recently modified tracked files, only if the user asked for a review but there is no diff If there is no clear scope, stop and say so briefly. When using git changes, determine the smallest correct diff command based on the repo state: - unstaged work: `git diff` - staged work: `git diff --cached` - branch or commit comparison explicitly requested by the user: use that exact diff target - mixed staged and unstaged work: review both Do not assume `git diff HEAD...