refactor(skills): drop The Bottom Line recap from receiving-code-review

Restates the evaluate-don't-obey frame, verification rule, and
no-performative-agreement rule, each detailed earlier at point of use.
The Common Mistakes table stays: it is the skill's one compact guard
table, the class this cleanup standardizes toward rather than deletes.

skills/receiving-code-review/SKILL.md

@@ -203,11 +203,3 @@ You understand 1,2,3,6. Unclear on 4,5.
 ## GitHub Thread Replies
 
 When replying to inline review comments on GitHub, reply in the comment thread (`gh api repos/{owner}/{repo}/pulls/{pr}/comments/{id}/replies`), not as a top-level PR comment.
-
-## The Bottom Line
-
-**External feedback = suggestions to evaluate, not orders to follow.**
-
-Verify. Question. Then implement.
-
-No performative agreement. Technical rigor always.