Add .editorconfig

[dwmkerr]

@claude add a basic .editorconfig file with sensible defaults for this repo (2-space indent for yaml/json/js/sh, utf-8, lf line endings, trim trailing whitespace). Push a branch and provide a PR link.

[github-actions]

Claude finished @dwmkerr's task in 30s —— View job • claude/issue-85-20260224-1811 • Create PR ➔

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Tasks

• Gather context
• Create .editorconfig file
• Commit and push changes
• Provide PR link

Created .editorconfig with:

• utf-8 charset and lf line endings for all files
• trim_trailing_whitespace and insert_final_newline globally
• 2-space indent for yml, yaml, json, js, sh
• Tab indent for Makefile (required by make)