--log-level DEBUG fails to log anything

### Description

On macos, when ~/.local/share/opencode/log contains 10 log files, running opencode --log-level DEBUG fails to log. Seems like a log rotation issue.

### Plugins

none

### OpenCode version

1.2.27

### Steps to reproduce

execute: opencode --log-level DEBUG

### Screenshot and/or share link

_No response_

### Operating System

macos 26.4

### Terminal

iTerm2