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/portal.md

@@ -2,7 +2,7 @@
 
 **Package:** `zappier`  
 **Source:** `packages/zappier/src/portal.ts`  
-**Lines:** 328
+**Lines:** 337
 
 ## What this module is
 
@@ -51,10 +51,11 @@ Implementation module in `zappier`. The tables below are extracted from the sour
 - `./credits`
 - `./statement`
 - `./billing-nats`
+- `./verae-bind`
 
 ## Call graph (identifiers invoked)
 
-`now`, `reload`, `customer`, `publicProfile`, `sessionAuth`, `header`, `startsWith`, `slice`, `get`, `list`, `find`, `status`, `json`, `next`, `save`, `portalRouter`, `post`, `trim`, `test`, `hashPassword`, `findByEmail`, `randomBytes`, `toString`, `create`, `verifyPassword`, `verifyTotp`, `use`, `delete`, `setUTCDate`, `setUTCHours`, `summaryFor`, `tiers`, `applyMonthlyCredit`, `rateCard`, `async`, `natsStatement`, `composeStatement`, `listFor`, `type`, `send`, `renderInvoiceHtml`, `generateTotpSecret`, `totpUri`, `qr`, `isInteger`, `natsPublish`, `natsAdjust`, `put`
+`now`, `reload`, `customer`, `publicProfile`, `sessionAuth`, `header`, `startsWith`, `slice`, `get`, `list`, `find`, `status`, `json`, `next`, `save`, `portalRouter`, `post`, `async`, `trim`, `test`, `hashPassword`, `findByEmail`, `randomBytes`, `toString`, `bindVeraeUser`, `create`, `verifyPassword`, `verifyTotp`, `use`, `delete`, `setUTCDate`, `setUTCHours`, `summaryFor`, `tiers`, `applyMonthlyCredit`, `rateCard`, `natsStatement`, `composeStatement`, `listFor`, `type`, `send`, `renderInvoiceHtml`, `generateTotpSecret`, `totpUri`, `qr`, `isInteger`, `natsPublish`, `natsAdjust`, `put`
 
 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.