billing.ts branches: 78.66% → 82.66%
- isDocFastSubscription expanded product object (not just string)
- isDocFastSubscription error handling path
- getOrCreateProPrice: new product + price creation
- getOrCreateProPrice: existing product, no active prices
keys.ts:
- createProKey UPSERT ON CONFLICT path (DB-only key)
- downgradeByCustomer customer not found in cache or DB
- updateKeyEmail DB fallback not-found path
- updateEmailByCustomer DB fallback not-found path
14 new tests, all 743 passing.
