ci: enforce LF line endings via .gitattributes to satisfy rustfmt newline_style on Windows

Author: matteius

.gitattributes

@@ -0,0 +1,34 @@
+# Normalize line endings and enforce LF in the working tree on all platforms
+* text=auto
+
+# Enforce LF for source and config files (prevents CRLF on Windows runners)
+*.rs   text eol=lf
+*.toml text eol=lf
+*.md   text eol=lf
+*.yml  text eol=lf
+*.yaml text eol=lf
+*.sh   text eol=lf
+*.ts   text eol=lf
+*.tsx  text eol=lf
+*.js   text eol=lf
+*.jsx  text eol=lf
+*.json text eol=lf
+*.css  text eol=lf
+*.scss text eol=lf
+*.html text eol=lf
+*.sql  text eol=lf
+
+# Treat common binary files as binary (no line ending conversion)
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.svg binary
+*.ico binary
+*.pdf binary
+*.zip binary
+*.tar binary
+*.gz binary
+*.tgz binary
+*.xz binary
+*.7z binary