chore: repository clean-up and clarifications

[ViTeXFTW]

Greptile Overview

Greptile Summary

Documentation cleanup removing empty CHANGELOG.md and updating README.md and CLAUDE.md to reflect current project state.

• Removed empty CHANGELOG.md that contained no meaningful content
• Updated CLAUDE.md with test build commands, complete dependency list (GoogleTest), testing guidelines (TDD), removed outdated performance note, marked phases 7-8 as done
• Simplified README.md by removing redundant sections, adding EA disclaimer, referencing build scripts instead of manual commands, and updating all implementation phases to "Done"
• Added future development plans mentioning terrain rendering for maps

Confidence Score: 5/5

• This PR is safe to merge with no risk
• All changes are documentation-only (markdown files) with no code modifications, removing outdated content and improving clarity
• No files require special attention

Important Files Changed

Filename	Overview
CHANGELOG.md	Deleted empty changelog file with no content
CLAUDE.md	Updated build commands, dependencies, architecture docs, implementation phases, and added testing guidelines
README.md	Simplified overview, added disclaimer, updated build instructions to reference scripts, and updated development status

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[ViTeXFTW]

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