Normalize line endings to LF; mark binary assets

.gitattributes

@@ -0,0 +1,13 @@
+# Normalize line endings: treat files as text and check out with LF.
+# Prevents CRLF/LF churn showing whole files as "modified".
+* text=auto eol=lf
+
+# Binary assets — never normalize.
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.ico binary
+*.pdf binary
+*.woff binary
+*.woff2 binary