Function saveConfig

devctx/src/utils/config.ts:59–66

(partial: Partial<UserConfig>)

 * Merges with existing config so partial updates work.
 */
export async function saveConfig(partial: Partial<UserConfig>): Promise<void> {
    const dir = await getDevCtxDir();
    const configPath = path.join(dir, "config.json");

    const existing = await loadConfig();
    const merged = { ...existing, ...partial };
    fs.writeFileSync(configPath, JSON.stringify(merged, null, 2));
}