Normalize all text files to UTF-8 + LF line endings

[treeform]

Normalizes every text file in this repo to plain UTF-8 with LF (Unix) line endings.

What changed

• 1 file converted from CRLF to LF line endings.
• Adds .gitattributes with * text=auto eol=lf, so Git normalizes line endings on commit and checks files out as LF on every platform. Without this, the next contributor on Windows silently reintroduces CRLF.

Notes

• Content is otherwise untouched — this is a pure encoding/line-ending change. git diff -w --ignore-cr-at-eol on this branch is empty.
• Binary files (images, fonts, archives, compiled artifacts) were not touched.

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