docs: add version notice warning about pre-v1 releases (#2824)

This PR adds a prominent warning in the README to inform users not to
use tags or releases before v1.0.0, as they are not considered stable
and may contain breaking changes.

Fixes #2823

Generated with [Claude Code](https://claude.ai/code)

---------

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Marko <[email protected]>

Author: 2 people

README.md

@@ -8,6 +8,8 @@ Ev-node is the basis of the Evolve Stack. For more in-depth information about Ev
 [![GoDoc](https://godoc.org/github.com/evstack/ev-node?status.svg)](https://godoc.org/github.com/evstack/ev-node)
 <!-- markdownlint-enable MD013 -->
 
+> **⚠️ Version Notice**: Do not use tags or releases before v1.*. Pre-v1 releases are not stable and should be considered abandoned. 
+
 ## Using Evolve
 
 Evolve supports multiple sync modes: