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Before: ~5% probabilistic pending invoices meant UAT couldn't reliably find billing test data. Shedward was blocked from testing Pay Now flows. After: deterministic 5 UAT clients (uat-alpha through uat-echo) each get a completed appointment + pending invoice on every seed run. Client names and emails documented in Shedward AGENTS.md for direct access. Co-Authored-By: Paperclip <noreply@paperclip.ing>