Why: The user approved the W3 remainder at stage 6 on 2026-10-20 and authorized merging RDM #451 into RDM main.
Evidence: RDM #451 merged at 76b4c05 after head f3fa0c0 status success; merged tree 4cfacf16 matches the pre-merge merge-tree.
Impact: Task cards and review package only; W4 write entry points must first add node placement checks.
Refs: Agent-System-RDM#451, Agent-System-Dev#641
Co-authored-by: Cursor <cursoragent@cursor.com>