Milestone 2: module/model docs (MD, Sphinx RST, PDF) and work log

74 source modules documented with extracted signatures, JSDoc params,
imports, and call graphs. 10 first-class models (PriceRule through
StatusResponse) have their own MD/RST/PDF. Sphinx HTML builds from
docs/sphinx. Per-module PDFs in docs/modules-pdf and docs/models-pdf.

Middleware gates 2–6 and 10 pass on MOCK_VERAE without NATS.

Learned: RST includes are relative to the RST file; keep one PDF per
module; Add Numbers remains the only push required tomorrow.

docs/sphinx/modules/zappier/admin-users.md

@@ -0,0 +1,59 @@
+# `zappier/admin-users`
+
+**Package:** `zappier`  
+**Source:** `packages/zappier/src/admin-users.ts`  
+**Lines:** 76
+
+## What this module is
+
+Implementation module in `zappier`. The tables below are extracted from the source (signatures + JSDoc).
+
+## Exports
+
+`AdminUser`, `AdminUserRepo`, `newAdminUserId`, `seedAdminUsersFromEnv`, `makeAdminUser`, `InMemoryAdminUserRepo`
+
+## Types / interfaces / classes
+
+| Kind | Name |
+|------|------|
+| interface | `AdminUser` |
+| interface | `AdminUserRepo` |
+| class | `InMemoryAdminUserRepo` |
+
+## Functions
+
+| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
+|------|------------|---------------------|---------|-----------------------------|
+| `newAdminUserId` | `(none)` | — | `unknown` | see Call graph |
+| `seedAdminUsersFromEnv` | `(none)` | — | `unknown` | see Call graph |
+|  | _The env-backed seed accounts (preserved from the pre-table behavior)._ | | | |
+| `makeAdminUser` | `username: string, password: string` | — | `unknown` | see Call graph |
+
+## Methods (class / object)
+
+| Name | Parameters |
+|------|------------|
+| `list` | `(none)` |
+| `findByUsername` | `username: string` |
+| `save` | `user: AdminUser` |
+| `list` | `(none)` |
+| `findByUsername` | `username: string` |
+| `save` | `user: AdminUser` |
+
+## What it imports / requires
+
+- `crypto`
+- `./accounts`
+
+## Call graph (identifiers invoked)
+
+`list`, `findByUsername`, `save`, `newAdminUserId`, `randomBytes`, `toString`, `accounts`, `seedAdminUsersFromEnv`, `makeAdminUser`, `hashPassword`, `now`, `constructor`, `map`, `seeded`, `find`, `findIndex`, `push`
+
+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`.
+