Add .gitattributes to normalize line endings across machines

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitattributes

@@ -0,0 +1,30 @@
+# Force consistent line endings across all machines
+# LF in the repo, native (CRLF on Windows) in working tree
+* text=auto
+
+# Source code — always normalize
+*.cpp text
+*.h text
+*.cs text
+*.py text
+*.ini text
+*.json text
+*.md text
+*.xml text
+*.yaml text
+*.yml text
+
+# Unreal assets — binary, no normalization
+*.uasset binary
+*.umap binary
+*.uproject text
+
+# Binaries — no normalization
+*.dll binary
+*.exe binary
+*.pdb binary
+*.lib binary
+*.exp binary
+*.so binary
+*.dylib binary
+*.a binary