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STATUS/HANDOFF S51 (Mig 43->45, tables 91->92, test 181->186, bundle Cg9mvltU/YgqDvsqr, P11-C DONE) + gotchas #57 ext (2->3 HRM catalog Mig 45 + Master ext backlog Mig 46 worktree) + session log 2026-06-08-S51. Agent-memory flush (impl-be/fe + test + cicd + investigator self-write; reviewer em-main proxy [return truncated gotcha #53]). CI-skip (docs/.md only). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>