Note

Adds project-wide .editorconfig, replaces manual null checks with ThrowIfNull, and marks MsSql extractor helper methods as static.

• Project config:
  • Add .editorconfig to enforce C# formatting, naming, and analyzer severities.
• Application:
  • Replace manual null checks with ArgumentNullException.ThrowIfNull in CustomTextFormatter.Format and SchemaExportService.ExportSchemaAsync.
  • Minor logging/message formatting tweaks in SchemaExportService.
• Infrastructure:
  • Mark MsSqlSchemaExtractor helpers ExtractTablesAsync and ExtractColumnsAsync as static.
• CLI:
  • Minor cleanup (remove unused using; small formatting around config path validation).

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