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- seed.ts: existingAccount branch now re-hashes the current SEED_UAT_*_PASSWORD env value and updates the stored credential. Re-running the seed now properly rotates credentials. - seed-uat-credentials.test.ts: AC-5 updated to reflect update (not insert) behavior on existing accounts. AC-5b added to verify password rotation when re-seeded with a new env password. Fixes GRO-1977. Unblocks GRO-1969. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>