Bind each customer to a Verae userId for hop tracing

Signup registers/binds a Verae central user and stores veraeUserId. Public access stays the zappier API key. Chain JWTs stay server-side behind tokenRef. Authz, billing, and jobs.watch carry veraeUserId.

docs/sphinx/modules/zappier-account-balance/books.md

@@ -2,7 +2,7 @@
 
 **Package:** `zappier-account-balance`  
 **Source:** `packages/zappier-account-balance/src/books.js`  
-**Lines:** 90
+**Lines:** 100
 
 ## What this module is
 
@@ -30,8 +30,9 @@ Implementation module in `zappier-account-balance`. The tables below are extract
 | Name | Parameters |
 |------|------------|
 | `constructor` | `(none)` |
+| `remember` | `customerId, veraeUserId` |
 | `prepaidCents` | `customerId` |
-| `adjust` | `{ customerId, cents, reason, agent, kind = 'credit' }` |
+| `adjust` | `{ customerId, cents, reason, agent, kind = 'credit', veraeUserId }` |
 | `recordUsage` | `entry` |
 | `recordPayment` | `entry` |
 | `statement` | `customerId` |
@@ -42,7 +43,7 @@ _No imports detected._
 
 ## Call graph (identifiers invoked)
 
-`constructor`, `prepaidCents`, `adjust`, `trunc`, `now`, `toString`, `random`, `slice`, `toISOString`, `unshift`, `recordUsage`, `recordPayment`, `statement`, `filter`, `match`, `handle`, `endsWith`
+`constructor`, `remember`, `prepaidCents`, `adjust`, `trunc`, `now`, `toString`, `random`, `slice`, `toISOString`, `unshift`, `recordUsage`, `recordPayment`, `statement`, `filter`, `match`, `handle`, `endsWith`
 
 Each identifier is a call site in this file. Follow the import list to see the defining module; open that module’s MD for parameter and return types.