Native app uses supabase.auth.signInWithPassword directly, bypassing
/api/auth/login. This authenticated endpoint runs the same device-lock
check post-auth: 409 DEVICE_LOCKED if bound to another user, 200+bind
if Pro/Legend user, no-op bind for Free users. CORS headers extended
to include x-device-name/model/os. 34 tests green.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>