Add .gitattributes to enforce LF line endings

[Copilot]

Without a .gitattributes file, line endings depend on each contributor's local core.autocrlf setting, causing CRLF to appear in committed Markdown/YAML files from Windows contributors and producing noisy diffs.

Changes

• .gitattributes — Added at repo root with:
  • * text=auto eol=lf — auto-detects text vs. binary and enforces LF storage for all text files
  • Explicit text eol=lf rules for .md, .yaml, .yml, .json, .py as a safety net for known text types

# Normalize all text files to LF
* text=auto eol=lf

# Explicitly mark file types
*.md text eol=lf
*.yaml text eol=lf
*.yml text eol=lf
*.json text eol=lf
*.py text eol=lf

Ran git add --renormalize . after adding the file — all existing files already use LF, so no content changes result from renormalization.

[Copilot]

Pull request overview

Adds a repository-wide .gitattributes to normalize text files to LF, reducing noisy diffs caused by contributors committing CRLF line endings from Windows setups.

Changes:

• Introduces .gitattributes at the repo root to enforce LF for text files.
• Adds explicit LF rules for common file extensions as a safety net.