diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..c73ee6d
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,29 @@
+# Ensure LF line endings in repository for cross-platform CI builds.
+# Without this, Windows clients commit CRLF and the Linux runner can't
+# parse YAML / Inno Setup scripts / shell heredocs reliably.
+
+* text=auto eol=lf
+
+# Explicit LF for source code and configs.
+*.go    text eol=lf
+*.yml   text eol=lf
+*.yaml  text eol=lf
+*.toml  text eol=lf
+*.json  text eol=lf
+*.md    text eol=lf
+*.sh    text eol=lf
+*.iss   text eol=lf
+*.bat   text eol=crlf
+*.ps1   text eol=crlf
+
+# Binaries — never normalize.
+*.dll       binary
+*.sys       binary
+*.lib       binary
+*.exe       binary
+*.png       binary
+*.jpg       binary
+*.ico       binary
+*.bin       binary
+*.zip       binary
+*.7z        binary