fix: implement automatic version detection from package.json

- Replace hardcoded version string with dynamic reading from package.json
- Add version caching for performance
- Export getBrainyVersion function from main index
- Ensures version stays automatically synchronized with releases

src/index.ts

@@ -50,6 +50,9 @@ export {
   getStatistics
 }
 
+// Export version utilities
+export { getBrainyVersion } from './utils/version.js'
+
 // Export embedding functionality
 import {
   UniversalSentenceEncoder,