fix: remove outdated current version note from README.md

Author: Madraka

README.md

@@ -8,7 +8,6 @@ LNMP (LLM Native Minimal Protocol) is a minimal, tokenizer-friendly, semantic-ID
 [![Rust](https://img.shields.io/badge/rust-1.91%2B-orange.svg)](https://www.rust-lang.org)
 [![Downloads](https://img.shields.io/crates/d/lnmp.svg)](https://crates.io/crates/lnmp)
 
-**Current Version: v0.5.15
 
 > **📋 FID Registry:** All Field IDs have official definitions in [`registry/fids.yaml`](registry/fids.yaml). See [`spec/fid-governance.md`](spec/fid-governance.md) for governance rules.