docs(cr-checklist): task #61 + task #30 B3 close-out sediment fold-in (#1932)

§ 四 加 8 lesson sediment（task #30 B3 + task #61 全 P0 闭环累计实证）+ § 六 sediment 引用追加 6 PR commit cross-link + § 八 修订记录追加本 PR fold trail。

新增 lesson:
- Lesson #12 v7.4: external API raw contract verify (task #61 P0-B PR #1930
  Qdrant euclid raw direction first-application + fix-forward 1e30a00)
- Lesson #12 v8 second-application: test docstring fake guardrail (task #61
  P0-G1 PR #1927 description_parts assertion 缺位 fix-forward 1953933)
- Lesson #12 v9: first-principles verify catch surface signal mistakes
  (task #61 P0-V1 重新定性 Bryce + task #61 P0-B Qdrant euclid Weston catch
  双独立 source 同源 first/second-application)
- Lesson #13 v2.3: deploy manifest dual-side rewrite (task #61 P0-D1 PR #1929
  Helm Neo4j worker env first-application)
- Lesson #13 v3 application demo 2: cross-source default value alignment
  (task #30 B3 PR #1925 commit dae43f5 三 source 同步 first-application)
- Lesson #14 application demo: spec 内部 default 漂浮 multi-iteration cleanup
  (task #30 B3 PR #1925 fix-forward dae43f5 § 3.1.1 line 85 cleanup
  second-application demo, first-application 在 task #35 6 轮 fix-forward)
- Lesson #16: CI workflow paths filter dead reference 反 pattern (task #61
  P0-W1 PR #1926 first-application demo + Lesson #15 file-move 3-step verify
  升级到 v2 4-step grep .github/workflows/*.yml paths 同步)
- Lesson #17: backend 收敛 contract 优于上层 fork (simple-stable + private-deploy
  paramount directive earayu2 msg=1224bec8 在 cross-adapter contract 设计时
  应用; task #69 P0-B + task #70 P1 候选 1 cross-PR 一次性收敛 first-application)

跨 PR 多独立 source 同源 catch trail:
- Lesson #12 v9: Bryce msg=23a2f514 + Weston msg=86e05a8e 双独立 source
- Lesson #16: chenyexuan msg=f298011e + 冬柏 msg=3e93bb64 双独立 source
- Lesson #17: cuiwenbo msg=cedc7703 + Bryce msg=9895a148 双独立 source
- Lesson #13 v3 application demo 2: huangheng msg=bf785b12 + Planetegg
  msg=c63acbf5 + Weston msg=1e6b0838 三独立 source

per architect msg=c4cdf634 + msg=daaeeab5 + msg=03c892e0 sediment dispatch.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: earayu