docs: Simplify security policy to support only latest version

Update supported versions table to indicate only the current release
receives security patches, avoiding the need to update version numbers
with each release.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: FunKite

SECURITY.md

@@ -2,12 +2,12 @@
 
 ## Supported Versions
 
-We release patches for security vulnerabilities for the following versions:
+Only the **latest released version** receives security patches. We recommend always upgrading to the newest version.
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 0.4.x   | :white_check_mark: |
-| < 0.4   | :x:                |
+| Latest  | :white_check_mark: |
+| Older   | :x:                |
 
 ## Reporting a Vulnerability