fix: install the native CN sandbox backend by its package name

Author: speak-agent

.agents/docs/2026-10-08-llvm-2313-part2-execution-and-dependencies.md

@@ -441,3 +441,17 @@ Windows job `113112389601` 的线程源码摘要为
 复制到应用和计算摘要使用相同字节。该规则不改变摘要算法或运行断言。
 使用 `core.autocrlf=true` 的独立 checkout 验证 LF 字节及当前 JSON
 模板摘要一致；实际 Windows checkout 的验证由后续 CI 承担。
+
+## 20. 2026-10-08 正式 CN 隔离后端包名更正
+
+Ubuntu 的 `bwrap` 可执行文件由 `bubblewrap` 包供应。正式 CN 工作流
+与后端版本记录将 `bwrap` 映射为该包名，实际 SubOS 后端参数及路径
+继续使用 `bwrap`。`proot` 的包名与后端名相同。此更正保证所选后端
+的安装和来源记录一致；正式 CN 运行仍等待公开发布后的验收。
+
+提交 `8131ca36` 与索引候选 `84c27c30` 的原生 GNU 验收运行
+`37717241617` 已成功。实际日志记录 147 个单测程序通过、四个真实
+索引成员通过，以及原生 openkal 的 JSON 和 TLS 双成功行。其
+mcpp-index 提交为 `b2f1e693248042c445c75fb020d49c428e6a1f78`。
+随后源码换行属性与 CN 包名修正不改变此原生引擎及应用源码的行为；
+该证据仍不替代最终四宿主目标运行与公开 CN 发布消费。

.github/tools/run_published_arm64_cn.sh

@@ -46,7 +46,9 @@ cp "$base/data/xim-pkgindex/.xlings-index-cache.json" "$base/reports/outer-publi
 # ARM package. The published bwrap package is x86-only. The client locates the
 # system proot directly; bwrap's current locator needs this explicit private
 # system-backend directory. Record the symlink and actual distro version.
-dpkg-query -W "$backend" | tee "$base/reports/backend-version.txt"
+backend_package="$backend"
+[[ "$backend" != bwrap ]] || backend_package=bubblewrap
+dpkg-query -W "$backend_package" | tee "$base/reports/backend-version.txt"
 command -v "$backend" | tee "$base/reports/backend-path.txt"
 sha256sum "$(command -v "$backend")" > "$base/reports/backend.sha256"
 if [[ "$backend" == bwrap ]]; then

.github/workflows/ci-arm64-published-cn.yml

@@ -37,8 +37,10 @@ jobs:
           set -euo pipefail
           test "$(uname -m)" = aarch64
           sudo apt-get update
-          sudo apt-get install -y "$SANDBOX_BACKEND"
-          dpkg-query -W "$SANDBOX_BACKEND"
+          backend_package="$SANDBOX_BACKEND"
+          [ "$SANDBOX_BACKEND" != bwrap ] || backend_package=bubblewrap
+          sudo apt-get install -y "$backend_package"
+          dpkg-query -W "$backend_package"
       - name: Exact public CN release in a cold real SubOS
         run: bash .github/tools/run_published_arm64_cn.sh "$RELEASE_VERSION" "$GITHUB_WORKSPACE" "$SANDBOX_BACKEND"
       - uses: actions/upload-artifact@v4

CHANGELOG.md

@@ -22,6 +22,14 @@
 - Install explicitly requested toolchains for graph-supplied targets even when
   the host payload matrix cannot serve the target. Preserve the refusal for
   engine-selected foreign payloads.
+- Keep AArch64 host `std` modules and build programs on the same compiler-rt
+  code-generation settings. Suppress the driver's automatic unwinder library
+  when a self-contained ELF already links its static unwinder explicitly.
+- Stop E2E package discovery from exporting GCC's reserved `GCC_ROOT` variable,
+  which redirected managed Windows GCC helper lookup to the registry wrapper.
+- Verify the native ARM64 openkal stack and indexed JSON serialization and
+  parsing, hosted TLS, thread destruction and concurrent exception unwinding
+  in the four-host cross-target matrix.
 - Cover both xcode-27 E2E shards and exercise explicit toolchain installation
   with a cold registry. Restore historical measurements to their original
   environment and adapt the namespace fixture to libc++ 23.

docs/specs/README.md

@@ -38,7 +38,7 @@
 | [SPEC-006](toolchain-management.md) | 工具链管理:身份、来源、选择与载荷契约 | 草案 v0.6 | 2026-10-02 | 逐条标注;已实现条款 mcpp >= 2026.9.24.1;§3.7 mcpp >= 2026.9.28.1;§3.7.1 mcpp >= 2026.9.28.2;§2.2.1 与 §3.3 的非缺省来源 mcpp >= 2026.10.1.3 |
 | [SPEC-007](build-plugins.md) | 构建插件:配置、施工与校验的分工,运行时与规划期的义务 | 草案 v0.6 | 2026-09-28 | 逐条标注;mcpp >= 2026.9.26.2;v0.3 条款 mcpp >= 2026.9.27.1;v0.4 条款 mcpp >= 2026.9.28.1;v0.5 条款 mcpp >= 2026.9.28.2;v0.6(§9)mcpp >= 2026.9.28.3 |
 | [SPEC-008](library-interface.md) | 库的接口:公开模块、发布闭包与两种形态的一致 | 草案 v0.1 | 2026-09-28 | 第一阶段(只警告)mcpp >= 2026.9.28.3 |
-| [SPEC-009](toolchain-maintenance.md) | 工具链的支持与维护:版本线、默认值、来源、移动与退役 | 草案 v0.3 | 2026-10-05 | 逐条标注;本版只有规范,多数条款未实现 |
+| [SPEC-009](toolchain-maintenance.md) | 工具链的支持与维护:版本线、默认值、来源、移动与退役 | 草案 v0.5 | 2026-10-08 | 逐条标注;本版只有规范,多数条款未实现 |
 
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