Why: the backend fix unblocks account management, login and conversation flags on the postgres tier (1/0 literals and int scans rejected with 42804). Evidence: backend PR #64 merged; live pg1 CLI verified (reset-password + user list OK); combined make test green. Impact: dev pins move to the fixed backend; no other surface changes. Refs: Agent-System-Backend#64
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@ 6b2589c198