Consistent line endings

Block two specific line-ending hazards:

1. Mixed CRLF + LF in the same file. Almost always a Windows / Unix tool mixing on the same file. Diffs become noise; some parsers (notably make + bash + Python triple-quoted strings) handle it silently wrong.

2. Unix shebang + CRLF anywhere in the file. #!/bin/bash\r is the canonical “this script will not run” footgun - the kernel tries to invoke /bin/bash\r as the interpreter and prints bad interpreter: no such file or directory.

Windows-script extensions (.bat, .cmd, .ps1) and CRLF-required formats are exempt.

Fix#

Normalize to LF:

dos2unix <file>

or with sed:

sed -i 's/\r$//' <file>

Lock the convention in .gitattributes:

* text=auto eol=lf