local/auth.py used os.environ without importing os, so new_session raised
NameError. Every first visit to /api/session, every registration and every
login returned 500, which left Site checkout, cart recovery and the customer
portal unusable since the R2 stack change.
Read COOKIE_SECURE once as a module constant and share it with local/app.py
instead of resolving the same variable in two places.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
