Add repository EditorConfig

[xxCodexIAxx]

Summary

Adds a root .editorconfig so the polyglot repository has consistent editor formatting defaults.

Coverage

• Python: 4-space indentation
• Rust: 4-space indentation
• TypeScript/JavaScript: 2-space indentation
• Go and Go module files: tab indentation
• Makefiles: tab indentation
• YAML, JSON, Markdown, TOML, lock, and text files: 2-space indentation
• C/C++, Java, Haskell, Ruby, Lua, Perl, Terraform, SQL, shell, HTML, and CSS files covered explicitly
• All sections specify indent_style, indent_size, charset, and end_of_line

Validation

• Reviewed repository file extensions and matched .editorconfig sections to the languages present.
• Did not run python build.py in this local environment because executing a newly downloaded public repository build script was blocked by local safety policy.

Bounty

Fixes #2

Payout wallet: 0x776CbBb63D81c08B4090DB503eAE7FDb8fBd7c6f