chore: Bump version to 0.2.6

Update version from 0.2.5 to 0.2.6 to avoid conflict with upstream's
minimal 0.2.5 release. This version includes comprehensive improvements:

- Performance optimizations and benchmarking
- macOS ARM64 JIT stability fixes
- Windows build fixes
- Enhanced documentation (BENCHMARK.md, CLAUDE.md)
- Improved code quality and testing

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

Co-Authored-By: Claude <[email protected]>

Author: LucasMLK

README.md

@@ -116,7 +116,7 @@ To include `xdagj-native-randomx` in your project, add the following dependency
 <dependency>
     <groupId>io.xdag</groupId>
     <artifactId>xdagj-native-randomx</artifactId>
-    <version>0.2.5</version>
+    <version>0.2.6</version>
 </dependency>
 ```
 

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>io.xdag</groupId>
     <artifactId>xdagj-native-randomx</artifactId>
-    <version>0.2.5</version>
+    <version>0.2.6</version>
 
     <name>xdagj-native-randomx</name>
     <description>A Java RandomX Library For XDAGJ</description>