chore: add editorconfig for consistent code style

[CRF1408]

Adds an .editorconfig specifying four-space indentation and line endings for Python, YAML, JSON and Markdown files.

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Note

Sets up repository-wide editor configuration.

• Adds root-level .editorconfig
• Enforces end_of_line = lf and insert_final_newline = true for all files
• Specifies indent_style = space and indent_size = 4 for *.py, *.yaml, *.json, and *.md

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