REQ-MAT-DIRECT-COUPLE: two directly adjacent buildings whose output and input ports meet transfer items straight between them with no intervening belt, chaining the output emergence and input intake belts end to end across the shared edge. Uses the consumer's normal reservation-aware acceptance; on failure the item stays stuck at the producer's port. Amends REQ-MAT-BELT-ONLY (its sole exception) and cross-references the emerge/intake handoffs. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DZR44tA8sn4dPqDzAVXyps