Enforce LF line endings with .gitattributes (#6)

"* text=auto eol=lf" so text files are stored with LF, plus binary rules
for image types so their bytes are never converted. Existing
export-ignore rules are kept.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: bonelifer

.gitattributes

@@ -0,0 +1,10 @@
+# Normalize line endings to LF in the repository
+* text=auto eol=lf
+
+# Never convert line endings in binary files
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.webp binary
+*.ico binary