CX004 — removed

这篇还没有中文，下面是英文原文。

• Date: 2026-10-22 (Asia/Shanghai)
• Reason: jitter mom≈1.00× null @-O2; BCE erases check — not a speed smell
• Policy: id retired permanently; do not renumber other rules to fill the gap; do not reuse CX004 for a new smell.