Adjacent work: PDF receipts, encrypted blob+share mock, NATS tunnel, SHA256 Zapier action

Around remaining blockers (Zapier login, live Verae): generate PDF receipts
without extra deps; AES-256-GCM object store with tenant isolation and share
tokens; scripts/nats-tunnel.sh to NS1; SHA256 Hash Text local Zapier action;
scripts/test-offline.sh for the no-login suite.

Learned: other-tenant object GET is 403; share token is the mock unwrap path.

docs/sphinx/modules/verae-zapier-middleware/store/blobs.md

@@ -0,0 +1,55 @@
+# `verae-zapier-middleware/store/blobs`
+
+**Package:** `verae-zapier-middleware`  
+**Source:** `packages/verae-zapier-middleware/src/store/blobs.js`  
+**Lines:** 137
+
+## What this module is
+
+Implementation module in `verae-zapier-middleware`. The tables below are extracted from the source (signatures + JSDoc).
+
+## Exports
+
+`decryptBlob`, `putBlob`, `getBlobRecord`, `readBlobPlaintext`, `createShare`, `redeemShare`
+
+## Types / interfaces / classes
+
+_None extracted._
+
+## Functions
+
+| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
+|------|------------|---------------------|---------|-----------------------------|
+| `ensure` | `(none)` | — | `unknown` | see Call graph |
+| `encrypt` | `plaintext, key` | plaintext: `Buffer`, key: `Buffer` | `unknown` | see Call graph |
+| `decryptBlob` | `enc, key` | key: `Buffer` | `unknown` | see Call graph |
+| `putBlob` | `{ tenantId, sha256, filename, bytes, publicMetadata = {}, privateMetadata = {} }` | params: `object`, params.tenantId: `string`, params.sha256: `string`, params.filename: `string`, params.bytes: `Buffer`, params.publicMetadata: `object`, params.privateMetadata: `object` | `unknown` | see Call graph |
+| `getBlobRecord` | `id` | — | `unknown` | see Call graph |
+| `readBlobPlaintext` | `id, tenantId` | id: `string`, tenantId: `string` | `unknown` | see Call graph |
+| `createShare` | `{ blobId, fromTenantId, label }` | — | `unknown` | see Call graph |
+| `redeemShare` | `token` | token: `string` | `unknown` | see Call graph |
+
+## Methods (class / object)
+
+| Name | Parameters |
+|------|------------|
+| `persist` | `(none)` |
+| `persist` | `(none)` |
+
+## What it imports / requires
+
+- `node:crypto`
+- `./db.js`
+
+## Call graph (identifiers invoked)
+
+`ensure`, `getStore`, `encrypt`, `randomBytes`, `createCipheriv`, `concat`, `update`, `final`, `getAuthTag`, `toString`, `decryptBlob`, `createDecipheriv`, `from`, `setAuthTag`, `putBlob`, `randomUUID`, `toISOString`, `persist`, `getBlobRecord`, `readBlobPlaintext`, `createShare`, `redeemShare`
+
+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/store/blobs.rst

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+verae-zapier-middleware.store.blobs
+===================================
+
+Generated API sheet for ``verae-zapier-middleware/store/blobs``.
+
+.. include:: blobs.md
+   :literal:

docs/sphinx/modules/verae-zapier-middleware/store/db.md

@@ -2,7 +2,7 @@
 
 **Package:** `verae-zapier-middleware`  
 **Source:** `packages/verae-zapier-middleware/src/store/db.js`  
-**Lines:** 115
+**Lines:** 117
 
 ## What this module is