Add .editorconfig to standardize formatting across contributions

[Copilot]

Description

Without a .editorconfig, contributors' editors apply inconsistent formatting (trailing whitespace, final newlines, indent style), inflating diffs and making reviews harder. Adds a root .editorconfig so editors enforce consistent defaults automatically.

Settings:

• charset = utf-8, end_of_line = lf, insert_final_newline = true
• trim_trailing_whitespace = true globally; false for *.md (trailing spaces are semantic in Markdown — they produce <br>)
• indent_style = space, indent_size = 4 globally (Python, shell, etc.)
• indent_size = 2 for *.yml, *.yaml, *.json, *.md
• indent_style = tab for Makefile (required by make)

No existing files modified — isolated to the new config file only.

Type of change

• Bug fix
• New feature
• Documentation
• Maintenance / refactor

Testing

• Tested locally
• All existing tests pass
• Added tests for new functionality (if applicable)

[Copilot]

Pull request overview

Adds a repository-root .editorconfig to standardize basic formatting across editors, reducing noise in diffs and making contributions more consistent across the codebase.

Changes:

• Introduces a root .editorconfig with consistent defaults (LF, final newline, trimming whitespace, 4-space indent).
• Adds filetype-specific overrides (2-space indent for YAML/JSON/Markdown; preserve Markdown trailing spaces; tabs for Makefile).

[sergio-sisternes-epam]

Validated against the codebase: 4-space Python, 2-space YAML/JSON/MD, LF line endings, UTF-8 — all match existing conventions. Clean isolated config, no files modified. LGTM.

[tillig]

If you want to require a particular line ending for a file type you may also need to update .gitattributes to ensure folks trying to contribute from Windows don't accidentally mess up the line endings.

Alternatively, it may be interesting to...

• Not specify line endings in .editorconfig unless it's really important (like in shell scripts where CRLF may not be interpreted right regardless of OS)
• Set .gitattributes to include * text=auto to ensure line endings are auto-handled regardless of Git client config.

[sergio-sisternes-epam]

@copilot review feedback