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/verae-zapier-middleware/lib/identity.md

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+# `verae-zapier-middleware/lib/identity`
+
+**Package:** `verae-zapier-middleware`  
+**Source:** `packages/verae-zapier-middleware/src/lib/identity.js`  
+**Lines:** 17
+
+## What this module is
+
+Implementation module in `verae-zapier-middleware`. The tables below are extracted from the source (signatures + JSDoc).
+
+## Exports
+
+`normalizeVeraeUsername`, `stableVeraeUserId`
+
+## Types / interfaces / classes
+
+_None extracted._
+
+## Functions
+
+| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
+|------|------------|---------------------|---------|-----------------------------|
+| `normalizeVeraeUsername` | `username` | — | `unknown` | see Call graph |
+| `stableVeraeUserId` | `username` | — | `unknown` | see Call graph |
+
+## What it imports / requires
+
+- `node:crypto`
+
+## Call graph (identifiers invoked)
+
+`normalizeVeraeUsername`, `trim`, `toLowerCase`, `stableVeraeUserId`, `createHash`, `update`, `digest`, `slice`
+
+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.
+
+## Return values (how to read this)
+
+- HTTP route handlers return Express `res.json(...)` bodies (see route docs).
+- Zapier `perform` functions return a **single object** (creates) or an **array** (triggers/searches).
+- Pricing functions return integer **cents** on `Quote.totalCents`.
+

docs/sphinx/modules/verae-zapier-middleware/lib/identity.rst

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+verae-zapier-middleware.lib.identity
+====================================
+
+Generated API sheet for ``verae-zapier-middleware/lib/identity``.
+
+.. include:: identity.md
+   :parser: myst_parser.sphinx_