-- Record whether a phase verdict came from a judge INDEPENDENT of the agent that
-- did the work — a different provider family, not merely a different model.
--
-- `Verdict.independent` existed in the struct and in the logs before this column
-- did, so the field was a claim held in memory and thrown away. The audit question
-- this whole mechanism exists to answer — "was this work checked by something other
-- than the model that produced it?" — could not be asked of the database.
--
-- Defaults to false, which is the truth about every row written before now: the
-- judge was Claude and so was the agent.
ALTER TABLE mission_phase_evaluations
    ADD COLUMN IF NOT EXISTS independent boolean NOT NULL DEFAULT false;

-- Find the verdicts nobody independently checked.
CREATE INDEX IF NOT EXISTS mission_phase_evaluations_independent_idx
    ON mission_phase_evaluations (independent);