chore: add .editorconfig for consistent code formatting

[srpatcha]

Changes

chore: add .editorconfig for consistent code formatting

Signed with GPG.

[mnriem]

It looks like you are mixing two PRs?

[srpatcha]

Hi @mnriem, you're right — this PR has grown beyond the initial .editorconfig scope. I'll split it into separate PRs:

1. .editorconfig only (the original chore)
2. Validation workflow step (the new feature)

I'll restructure and resubmit. Thank you for the feedback!

[srpatcha]

Hi @mnriem, I've restructured the PR to contain only the .editorconfig change as originally described. The validation workflow step has been removed and will be submitted as a separate focused PR. Ready for re-review!

[Copilot]

Pull request overview

This PR adds a root .editorconfig to standardize editor behavior in the spec-kit repository, complementing the repo’s existing formatting/linting setup.

Changes:

• Adds global defaults for LF line endings, final newlines, UTF-8, and trailing-whitespace trimming.
• Adds file-type-specific rules for Python, YAML, Markdown, and Makefiles.

Show a summary per file

File	Description
.editorconfig	Introduces repository-wide editor defaults and per-file-type formatting settings.

Copilot's findings

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• Files reviewed: 1/1 changed files
• Comments generated: 2

[mnriem]

Please address Copilot feedback

[srpatcha]

Hi @mnriem @copilot, addressed the Copilot inline feedback:

1. ✅ Markdown indent (L18) — Added \indent_size = 2\ for *.md\ to match the markdownlint config (still keeps \ rim_trailing_whitespace = false\ for hard-break lines)
2. ✅ Bash/PowerShell coverage (L16) — Added explicit [.{sh,bash}]\ (2-space) and [.{ps1,psm1,psd1}]\ (4-space) sections for the scripts under \scripts/bash/\ and \scripts/powershell/\
3. ✅ **Defaults moved to []* — \indent_style = space\ and \indent_size = 4\ are now defaults; specific extensions only override the size
4. ✅ JSON coverage — Added [*.{json,jsonc}]\ at 2-space (the repo has a few config JSONs)

Force-pushed. Ready for re-review!

[srpatcha]

Hi @mnriem @copilot, just to confirm: the latest force-push (commit faf7b10) addresses both Copilot inline comments:

• L18/L19 (Markdown indent) ✅ Added [*.md] indent_size = 2 to match the markdownlint 2-space requirement
• L16 (Bash/PowerShell) ✅ Added explicit [*.{sh,bash}] indent_size = 2 and [*.{ps1,psm1,psd1}] indent_size = 4 sections covering scripts/bash/ and scripts/powershell/

The previous Copilot comments were on the older commit and may not auto-resolve since the file is now restructured (defaults moved to [*]). Let me know if anything else needs attention!