Add .editorconfig with default Visual Studio values

[Copilot]

The repository had no .editorconfig, leaving editor formatting behavior undefined across contributors.

Changes

• Added .editorconfig at the repository root with standard Visual Studio defaults for a C#/.NET project, covering:
  • All files – space indentation
  • C#/VB files – 4-space indent, UTF-8 BOM, final newline
  • XML project/config files – 2-space indent
  • JSON files – 2-space indent
  • Dotnet style – System.* usings first, no this. qualification, language keywords preferred, modern language feature suggestions
  • C# style – var preference, Allman brace style, expression-body rules, pattern matching suggestions, indentation/spacing/wrapping conventions

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• learn.microsoft.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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