Add zero dependencies note to README

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: IanGordonOne

README.md

@@ -2,6 +2,8 @@
 
 A command-line interface for LogSeq operations via its HTTP API.
 
+**Zero dependencies** — uses only Bun built-in APIs and native TypeScript.
+
 ## Requirements
 
 - [Bun](https://bun.sh/) runtime