[codex] replace Circle K signal with generic review guidance (#1531)

* Remove Circle K signal from review skill

* Add generic review hesitation guidance

* Use Jesse wording for review hesitation guidance

skills/receiving-code-review/SKILL.md

@@ -126,7 +126,7 @@ Push back when:
 - Reference working tests/code
 - Involve your human partner if architectural
 
-**Signal if uncomfortable pushing back out loud:** "Strange things are afoot at the Circle K"
+**If you're uncomfortable pushing back out loud:** Name that tension, then tell your partner about the issue you've seen. They'll appreciate your honesty.
 
 ## Acknowledging Correct Feedback