chore: keep line endings LF with .gitattributes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitattributes

@@ -0,0 +1,19 @@
+# Store text with LF line endings in the repository, whatever each
+# contributor's OS or core.autocrlf setting. Checkouts still get native
+# line endings where git is configured for them.
+* text=auto eol=lf
+
+# Windows-only scripts keep CRLF.
+*.bat text eol=crlf
+*.cmd text eol=crlf
+*.ps1 text eol=crlf
+
+# Never touch binary files.
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.ico binary
+*.zip binary
+*.mp4 binary
+*.whl binary