rewrite first paragraph, add unnecessary elaboration tell

prompts/LLM_PROSE_TELLS.md

@@ -1,9 +1,8 @@
 # LLM Prose Tells
 
-All of these show up in human writing occasionally. No single one is conclusive
-on its own. The difference is concentration. A person might lean on one or two
-of these habits across an entire essay, but LLM output will use fifteen of them
-per paragraph.
+Every pattern in this document shows up in human writing occasionally. They
+become diagnostic only through density. A person might use one or two across an
+entire essay, but LLM output packs fifteen into a single paragraph.
 
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