fix: format AGENTS.md to remove trailing whitespace

Author: rgbkrk

AGENTS.md

@@ -142,7 +142,7 @@ All dependencies are pinned in `deno.json` import maps.
 ## Communication Style
 
 - Be direct about what works and what doesn't
-- Don't oversell capabilities or use marketing language  
+- Don't oversell capabilities or use marketing language
 - Focus on helping developers solve actual problems
 - It's okay to say "this is a prototype" or "this part needs work"
 - Code examples are better than long explanations