docs(skills): drop deleted-content trigger examples from world-building description

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/skills/world-building/SKILL.md

@@ -7,7 +7,7 @@ description: >
   their knowledge/dialogue, quests, items, locations, or starting origins — even
   if they don't say "world-building" or name the content/ folder. Triggers on
   "write an NPC", "add a town/region/faction", "new quest", "a secret the party
-  can uncover", "expand the Tallow Reach", "flesh out Duncarrow", "someone the
+  can uncover", "expand a region", "flesh out a town", "someone the
   player meets on the road", "cursed item", "give me a storyline", and the like.
   The skill reconciles new content against existing canon (never contradicting or
   silently changing it), writes it in the exact source format the content build