docs: polish README and sync all translations (cycle 4)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people

README.md

@@ -6,7 +6,7 @@
 
 <h3 align="center">
   Claude's output is full of noise you don't need.<br>
-  ContextZip compresses it by 60-90%. <code>npx contextzip</code> → 5 seconds.
+  ContextZip compresses it by 60-90%. <code>npx contextzip</code> → 5 seconds (first run downloads binary).
 </h3>
 
 <p align="center">