Update coding/file style guidelines

[paulmedynski]

Changes to default settings:

• Changed default indent size from 4 to 2 spaces for all files.
• Added charset = utf-8 encoding requirement.
• Added trim_trailing_whitespace = true.
• Removed redundant file-type-specific indent rules (xml, shell scripts, etc.) since the new defaults cover them.

C# specific:

• Kept C# files at 4-space indentation (explicitly set).

Windows scripts:

• Simplified Windows script rule to only specify end_of_line = crlf since other defaults apply.

Removed sections:

• Removed explicit rules for XML files, shell scripts, and JSON/YAML (now covered by defaults).

Coding style:

New guidelines added:

• Rule 1: Text files should be UTF-8 encoded, no BOM, with Unix line endings (LF); Windows scripts may use CRLF.
• Rule 2: Lines should be a maximum of 100 characters (with exceptions for URLs and readability).

Formatting improvements:

• Reformatted the entire document to wrap lines at ~100 characters for better readability.
• Changed numbered list from 1. 2. 3. format to 1. 1. 1. (Markdown auto-numbering style).
• Improved line wrapping for all existing rules to follow the new 100-character guideline

[Copilot]

Pull request overview

Updates repository-wide formatting defaults and documents new style guidelines (encoding, line endings, and line length) while keeping C# indentation at 4 spaces.

Changes:

• Update .editorconfig defaults (2-space indent, LF, UTF-8, trim trailing whitespace) with explicit overrides for C# and Windows scripts.
• Refresh policy/coding-style.md to add new repo-wide text file rules and wrap lines to ~100 chars.
• Remove redundant file-type-specific .editorconfig sections now covered by the new defaults.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
policy/coding-style.md	Adds/rewraps guidelines (UTF-8/LF, 100-char lines) and reformats the rules list.
.editorconfig	Changes default formatting settings and simplifies per-file-type overrides (keeps C# at 4 spaces, Windows scripts CRLF).

[paulmedynski]

I think most of our files are already LF, so this seemed to make sense. VSCode won't change an existing file automatically.

[benrr101]

This one messes with things... Git default behavior at install on Windows is to checkout crlf and check in lf. Changing this at the IDE level will cause a flurry of warnings when commiting, iirc. While I agree, having consistent line ending is a good thing at the repo level, the conflict between IDE (editorconfig) and scm (git) will make a mess of things for Windows users.

For the record, you see that our files are LF already because you're working from linux :)

[paulmedynski]

Ok I will remove it and let individual devs decide based on their git and IDE config.

[benrr101]

Provisionally approving it...