fix(orchestrator): 升级器 maxBuffer 64MB + ✗ 日志截断（实机升级误判修复） - #91
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实机验证 v0.7.0 一键升级发现：build-web.sh 构建成功（exit 0）却被判失败—— execFile 默认 1MB maxBuffer 被 vite/npm 输出超限，err 一到，stdout 即弃。 升到 64MB；同时 ✗ 日志行加 clip()，失败只留首 300 字符，不再把整段 构建输出塞进 UI 升级横幅。 另实机确认：desktop profile pnpm up 首次会撞 minimumReleaseAge 供应链 策略（依赖刚发版距窗口太近），属外部策略瞬态，重试即过，升级器不改。 验证：system-upgrade 12 套全绿；UI 实测升级链路（见 PR 描述）。
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背景
v0.7.0 发版后实机验证「设置 → Workflow One → 一键升级」：升级链路跑到源码重建的 build-web.sh 步骤，UI 报 ✗ 失败——但构建实际成功（手动复跑 exit 0，产物齐全）。
根因
run()用execFile默认 1MB maxBuffer；build-web.sh 的 vite + npm 输出（含 document-preview 双份 chunk 清单 + install-scripts 警告）超限。maxBuffer 超限触发 err，stdout 一并丢弃——构建明明 exit 0 也被判失败。修复
maxBuffer: 64MBclip()（首 300 字符），整段构建输出不再塞进 UI 横幅实机另证（不改代码）
desktop profile（npm 渠道）首次
pnpm up撞minimumReleaseAge供应链策略：依赖dsh-better-sidebar@0.17.1刚发版 1.2h，距策略窗口不足。属外部策略瞬态，时间窗过后重试即过（已实测 ^0.7.0 落地）。升级器对这类失败本来就支持重试，行为正确。验证