docs(code-submission): promote 8-class to 9-class with round-7 summary-drift insight

[weicao]

Summary

Follow-up to PR #222 (merge commit 51baa0a). 升 8 类 → 9 类 blocker checklist, 加入第 9 类：summary / closeout 段与 body sections 单源漂移。

触发洞察来自 PR #221 round-7 (Sprint 2 DG/DR PromQL rule pack case v0.3.7 trail): §7 diff table / §10 关键依赖关系 / 一句话总结三处把 body §6.5.5 / §6.5.7 / §10 的 Rule 7/8 pending 分支写成 definite 已 lock, 摘要段读者按字面执行就会跳过 condition 检查。

第 9 类的边界 (与类 8 (b) 区分)

类	触发点	视角
类 8 (b)	某次 section 状态升级事件	升级时扫读者最先看的段落是否同步
类 9	任何 body 改动	摘要段是 body single-source consumer, 不能成为独立 source of truth

两类同源 (摘要漂移) 但视角不同, 都要跑。

同步更新

• 标题 / intro / docs/code-submission/README.md entry: 8 → 9
• §适用场景 表格 4 行: 8 类 → 9 类
• Reviewer Checklist 加类 9 行
• 反模式速查表加 "摘要重写" 一行
• ## 一句话总结 加 "摘要单源漂移" 维度

不漂移保证

• class 1-8 文字未动
• 案例附录 cross-link 仍指向 oracle-dg-dr-promql-rule-pack-sprint2-case.md (PR docs(cases/oracle): add DG/DR PromQL rule pack Sprint 2 handoff case #221 merge commit 1075112)
• 不引入新 KB 版本依赖

Test plan

• @john focused review: 类 9 定义 / 边界与类 8 (b) 区分 / Reviewer Checklist / 反模式表 / 一句话总结口径
• doc-only PR; 无 CI; 无 CODEOWNERS

[weicao]

Round-1 focused review: HOLD on 2 small wrapper/doc drift issues. Scope is doc/static only.

Checked:

• git diff --check origin/main...origin/pr-238 is clean.
• Commit message is clean; I did not see AI/tool/vendor attribution in the commit.
• Case cross-link target exists after PR docs(cases/oracle): add DG/DR PromQL rule pack Sprint 2 handoff case #221 landed.
• The new class-9 definition, boundary against class 8(b), reviewer checklist line, anti-pattern row, and final one-line summary are directionally OK.

Blockers:

1. PR body still has a GitHub-facing AI/tool footer: Generated with [Claude Code].
   This reintroduces the exact submission-discipline issue that PR docs(code-submission): add PromQL rule pack peer review 8-class blocker guide #222 / PR docs(cases/oracle): add DG/DR PromQL rule pack Sprint 2 handoff case #221 already cleaned up. Please remove the PR body footer. The commit message itself looks clean, so this is PR-body only from what I checked.

2. docs/code-submission/addon-promql-rule-pack-peer-review-blocker-class-guide.md:48-51 still says 8 类 in all four ## 适用场景 rows.
   The rest of the doc has mostly moved to 9 类, so this section now contradicts the title, intro, checklist, anti-pattern table, appendix, and one-line summary. Please update those rows to 9 类 / 九类.

After those two are fixed, I can do a quick round-2 focused review on PR body + lines 48-51 only.

[weicao]

Round-2 focused review: PASS.

Checked only the two round-1 HOLD points:

• PR body no longer contains Generated with [Claude Code] or other AI/tool/vendor footer strings.
• docs/code-submission/addon-promql-rule-pack-peer-review-blocker-class-guide.md:48-51 now says 9 类 in all four ## 适用场景 rows.

Also checked git diff --check origin/main...origin/pr-238: clean. The remaining “8 类” reference at the sister doc link is correct because it describes addon-design-contract-review-during-xp-guide.md, not this PromQL guide.

Boundary: doc/static focused review only.