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"Add complete documentation system"

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docs/Changelog.md

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+# Changelog
+
+## Version 1.0.3
+
+### Infrastructure
+
+* Migrated to Maven single-source versioning
+* Added GitHub update checking
+* Standardized version display system
+* Added GitHub repository support
+
+### Multiplayer
+
+* Fixed player selection conflicts
+* Added UUID-based selection tracking
+* Improved multi-user machine configuration
+
+### Reliability
+
+* Verified restart persistence
+* Verified chunk unload/reload handling
+* Verified player relog persistence
+* Verified machine recreation behavior
+
+### Administration
+
+* Improved version information display
+* Standardized update status reporting
+
+### Documentation
+
+* Added README documentation
+* Added MIT License
+* Added complete documentation system
+
+---
+
+## Future Releases
+
+Future changes will be documented here.