Tiny Mammoth · Q2 Brainstorm Verdict
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Build and run a $3,000 direct-mail experiment across HVAC/electrical/plumbing, auto repair, and restaurants in Pasadena + Glendale + Burbank using a 6×9 postcard with three vertical-specific copy variants — all driving to one CF Worker + D1 landing page with a segmented intake form. Run all three verticals in parallel in a single wave. Use two checkpoints (week 8 — inquiry signal; week 12 — close signal) to decide kill, adjust, or scale to $7K/mo recurring.
Framing is solid; both agents converged on the same plan with disagreements named. But every key number is still an industry estimate, not TM's actual data — cold-mail response rate (assumed 1–1.5%), cold-mail close rate (3–7%), cost per piece ($1.00–$1.50). The experiment exists to replace these estimates with real numbers. Until then, even "math pencils" has ±50% variance.
mail_inquiries table (schema in ROUND-02/codex.md)?vertical=hvac)Must resolve in the next 3–5 business days or wave 1 slips.