chore: add .editorconfig, minor cleanups

[nyurik]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.74%. Comparing base (b30aa97) to head (b192ef6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #32   +/-   ##
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  Coverage   89.74%   89.74%           
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  Files           3        3           
  Lines          78       78           
  Branches       78       78           
=======================================
  Hits           70       70           
  Partials        8        8           

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[Copilot]

Pull request overview

This PR enhances the repository's code quality infrastructure by adding comprehensive EditorConfig settings and performing minor maintenance cleanups. The changes standardize formatting rules across different file types and simplify MSRV (Minimum Supported Rust Version) testing procedures.

Key changes:

• Added detailed .editorconfig with file-type-specific indentation rules (2 spaces for YAML/Markdown, 4 spaces default)
• Integrated editorconfig-checker into pre-commit hooks for automated enforcement
• Simplified MSRV testing by consolidating separate check and test recipes into a single check command

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
.editorconfig	Expanded configuration with alphabetically sorted rules, added end_of_line enforcement, and file-type-specific indentation (YAML/Markdown: 2 spaces, LICENSE files: unset)
.pre-commit-config.yaml	Added editorconfig-checker hook (v3.6.0) to automatically validate EditorConfig compliance
justfile	Completed incomplete comment on line 3, removed separate check-msrv and test-msrv recipes in favor of simplified ci-test-msrv, and fixed shell block indentation in assert-git-is-clean to use consistent 4-space indentation

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[Copilot]

The MSRV verification has been significantly simplified. The new implementation only checks compilation of the main crate library with all features, whereas the previous implementation checked all targets (including tests, benches, and examples via --all-targets) and ran tests across the workspace.

This means MSRV compatibility is no longer verified for:

1. Test code, benchmarks, and examples (missing --all-targets)
2. Runtime behavior (tests are no longer executed)

If this simplification is intentional, consider documenting the reasoning. Otherwise, consider restoring --all-targets at minimum, or test execution if runtime MSRV compatibility is important.