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Two unique-constraint violations surfaced as an HTTP 500 with the raw Postgres constraint name leaked to the caller (#5914). - UpdateAgent now mirrors CreateAgent: a 23505 / agent_workspace_name_unique violation returns a clean 409 instead of a 500 whose body leaked the constraint name. The (workspace_id, name) constraint does not exclude archived agents, so renaming into a name still held by an archived agent hit exactly this path. - The mention enqueue detects the idx_one_pending_task_per_issue_agent violation, returns a bare typed sentinel (no driver text), and logs the benign race at debug instead of error. Review then hardened the same duplicate-enqueue path so it never reports an outcome it cannot back: coalesced only after an atomic head-scoped merge, deferred only when an active task's reconcile will replay the comment, queued only after a fresh enqueue, and an honest internal_error otherwise. Head scoping (TEN-356) is preserved throughout, planned-id registration excludes queued tasks so re-attribution stays atomic (MUL-4302), and a blocked completion replay is handed on rather than discarded. One shape remains best-effort — a different-head queued blocker can neither cover the comment nor accept it without violating TEN-356 — and is logged at error; that drop predates this change. Tracked in #5985. No migration, foreign key, or cascade. MUL-5285 Fixes #5914