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GRO-1325 was marked done but never implemented. This adds the missing Better-Auth user + account seeding for UAT email+password logins. For each SEED_UAT_*_PASSWORD env var present, the seed now: 1. Creates (or links to existing) a Better-Auth user record with emailVerified: true 2. Creates a credential account with providerId: "credential" and a bcrypt-hashed password (using better-auth/crypto) 3. Links the staff record to the Better-Auth user via userId Idempotent: skips user/account creation if already seeded. Updated UAT_PLAYBOOK.md §4.1 — TC-API-1.4 through 1.9 now reference the new seed provisioning (GRO-1325 was the missing piece). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>