docs: add keyword H1 for SEO

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

Author: TheStack-ai

README.md

@@ -1,3 +1,5 @@
+# zclean — Zombie Process Cleaner for AI Coding Tools
+
 <div align="center">
 
 <pre>
@@ -191,6 +193,8 @@ MIT — see [LICENSE](LICENSE).
 
 ---
 
+# zclean — Zombie Process Cleaner for AI Coding Tools
+
 <div align="center">
 
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