C · Phase 0 — audits & gates
All shopper-invisible. Runs now, during the IntelliGems test.
D · Phase 1 — extend the US product
Invisible. The master grows from 110 to ~134 variants — rehearsed first, additive only.
H · Phase 4 — the waves
Per wave: pre-flight → flip → verify → soak ~1 week. Rollback = revert one commit.