fix(skill-author): document plugin version bump in README

## Why
README "What it does" didn't reflect the plugin version bump step added
to both create and improve flows.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/kyberforge/.claude-plugin/plugin.json

@@ -8,5 +8,5 @@
   "keywords": [],
   "license": "MIT",
   "name": "kyberforge",
-  "version": "1.0.3"
+  "version": "1.0.4"
 }