Admin-assisted DOT services (UCR, BOC-3) routed to this handler were marked
ready_to_file with whatever intake existed -- e.g. a UCR with only a DOT number,
missing legal name / state / fleet-size bracket (which sets the UCR fee tier).
That made the admin 'ready to file' status dishonest and unfileable.
Now, for ADMIN_ASSISTED_REQUIRED services we first enrich intake from the FMCSA
census (legal_name, address_state, power_units) + the order email, and derive
the UCR fleet_size_bracket from power units (UCR_FLEET_BRACKETS). If every
required field is then present we persist it and mark intake validated (falls
through to the admin review gate -> ready_to_file). If anything is still
missing, we persist what we have, set fulfillment_status=awaiting_intake, and
email the customer to complete intake -- instead of falsely showing ready_to_file.
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