Add src/util/process.ts with spawn() and exec() wrappers that always set
windowsHide: true, preventing cmd.exe console popups on Windows.
Replace direct child_process imports in GitOps, shell-env, installer, and
server-manager with the new wrappers. Document the pattern in both
packages/kilo-vscode/AGENTS.md and packages/opencode/AGENTS.md so future
contributors know to use the wrappers instead of raw child_process calls.