Read securities and remaining cash entitlements that block closing the original deposit account

Verified staff/service with payments:investments:read or payments:investments:write supplies required account_id to inspect unfinished orders, custody lots and actual cash events that block original DDA closure. A disposed lot needs a final signed custodian close-out assertion with zero actual units and explicit zero remaining income after disposal. Sale or maturity alone does not establish no future dividend. This callback reads one consistent database inventory and actual ledger evidence without calling accounts or holding the custody writer lock.