codeg v0.32.5-rc.4

chore(release): rehearse 0.32.5-rc.4 from the computer-use branch

A release candidate built from task/227 (PR #870) before it is merged.
codeg-computer-helper now runs from a copy outside codeg.app, so macOS
charges Screen Recording to the helper rather than to codeg; this build
runs the whole release pipeline on that change. It is not on main and is
not meant for general use.

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发布流水线预演：电脑操作分支（task/227，PR #870）合入前构建的候选版本。codeg-computer-helper 改为从 codeg.app 之外的副本运行，屏幕录制权限归到 helper 而不是 codeg。不在 main 上，不供日常使用。