Why: PostgreSQL sequence IDs could commit out of order and make fixed project audit cursors permanently skip a late row.
Evidence: SELF PG cross-page RED, CACHE 10 counterexample, configuration drift RED/GREEN, and pre-commit Go, PG migration, and race receipts are recorded in the W9 task card. Fixed-HEAD checks follow this commit.
Impact: Guard implicit command audit ID allocation with a transaction advisory lock; reject unsafe sequence/default drift; preserve explicit-ID storage migration; report committed-prefix only for verified project pages.
Refs: Approved W9 PostgreSQL cutoff adjustment r1; W9 Backend task card.
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