Add .gitattributes with '* text=auto eol=lf' so Windows CRLF working
copies no longer surface as whole-file content changes; 37 tracked files
had flipped LF->CRLF with zero content change.
Ignore /tmp/ session scratch and research/experiments/node_modules, a
Windows junction git records as a symlink so **/node_modules/ misses it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016yuKikAXbByLvsUnh55SRd
