diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..8dde3d8
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,31 @@
+# EOL policy for dsh-memory.
+# Repo lives on Ubuntu 18, working copy on Windows with core.autocrlf=true.
+# These rules override autocrlf per file type.
+
+* text=auto
+
+# Source and data: always LF (Unix-compatible, safe for cross-platform transfer)
+*.js    text eol=lf
+*.mjs   text eol=lf
+*.cjs   text eol=lf
+*.json  text eol=lf
+*.md    text eol=lf
+*.txt   text eol=lf
+*.sh    text eol=lf
+*.py    text eol=lf
+*.yml   text eol=lf
+*.yaml  text eol=lf
+*.gitattributes text eol=lf
+*.gitignore     text eol=lf
+
+# Windows-only launchers: always CRLF (LF breaks cmd.exe / powershell)
+*.cmd   text eol=crlf
+*.bat   text eol=crlf
+*.ps1   text eol=crlf
+*.vbs   text eol=crlf
+
+# Binary: no conversion
+*.png   binary
+*.jpg   binary
+*.ico   binary
+*.svg   text eol=lf