STATUS/HANDOFF S52 (Phase 11 product COMPLETE, test 200, Mig 46, roster 11, bundle DYfjnpY0/_3S0BPJ2). Session log. Proxy-append implementer-backend + test-specialist diaries (Wave 2 agent killed by session-limit truoc MEMORY step). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>