ci: bootstrap pin -> 2026.7.27.1 (released, mirrored, indexed) - #294
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The separate post-release commit the pin guard now enforces: .xlings.json
and MCPP_PIN name a mcpp that already exists in xim-pkgindex, so they can
only move once the release has landed there.
Verified before bumping:
- four-platform release + GitCode mirror 8/8 byte-identical (cmp against
locally downloaded assets, not the upload exit code)
- xim-pkgindex#429 merged, its four sha256 values recomputed locally and
matching
- clean XLINGS_HOME: xlings install mcpp@2026.7.27.1 resolves the
four-segment version key, mcpp --version reports 2026.7.27.1, and a
bare-name dependency (eigen = "5.0.1") resolves, builds and runs
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发布后的独立 pin bump —— 也就是 #292 新增的守卫所强制的那一步：
.xlings.json与MCPP_PIN指向的必须是已在 xim-pkgindex 中存在的 mcpp，所以它们只能在 release 落地后才动。（#292 的第一版守卫把这条写成了「四处全等」，结果让 CI 去装一个还不存在的版本，全部 job 报
package 'mcpp@2026.7.27.1' not found。现在守卫检查的是「两个 bootstrap 站点互相一致」+「不得新于在建版本」。）bump 前已核验
cmp，不信上传退出码 ——gtc在obs_callback路径上会谎报成功）gtc补传后 rerun（幂等，跳过已服务资产）XLINGS_HOME真装：xlings install mcpp@2026.7.27.1解析出 4 段版本 key，mcpp --version报2026.7.27.1eigen = "5.0.1"解析、编译、运行通过（输出-2）2026.7.27.2，mcpp self env的xlings pinned与之一致 —— 即「mcpp 依赖的内部 xlings」确实随本次一起升到了最新