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Add 4 new models for Mission Control: - AgentConversationMessage: per-agent message storage with SSE streaming - AgentSessionTree: parent/child subagent relationships (taskSource field for mosaic-queue integration) - AgentProviderConfig: external provider registration per workspace (encrypted credentials) - OperatorAuditLog: append-only audit trail for barge-in/kill/pause actions Closes #693 (partial — schema only)