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/verae-zapier-middleware/debug/logger.md

@@ -0,0 +1,47 @@
+# `verae-zapier-middleware/debug/logger`
+
+**Package:** `verae-zapier-middleware`  
+**Source:** `packages/verae-zapier-middleware/src/debug/logger.js`  
+**Lines:** 122
+
+## What this module is
+
+Implementation module in `verae-zapier-middleware`. The tables below are extracted from the source (signatures + JSDoc).
+
+## Exports
+
+`setDebugTestSink`, `formatLogLine`, `createDebugger`
+
+## Types / interfaces / classes
+
+_None extracted._
+
+## Functions
+
+| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
+|------|------------|---------------------|---------|-----------------------------|
+| `setDebugTestSink` | `sink` | sink: `null|((line: string) => void)` | `void` | see Call graph |
+| `formatLogLine` | `{ level, namespace, message, meta, traceId }` | parts: `object`, parts.level: `string`, parts.namespace: `string`, parts.message: `string`, parts.meta: `Record<string, unknown>|undefined`, parts.traceId: `string|null` | `string` | see Call graph |
+| `emit` | `line, filePath` | line: `string`, filePath: `string|null` | `void` | see Call graph |
+| `createDebugger` | `namespace` | namespace: `string` | `Debugger` — Logger with debug/info/warn/error methods. | see Call graph |
+| `write` | `level, message, meta` | level: `'debug'|'info'|'warn'|'error'`, message: `string`, meta: `Record<string, unknown>` | `unknown` | see Call graph |
+
+## What it imports / requires
+
+- `node:fs`
+- `./config.js`
+- `./redact.js`
+- `./trace-context.js`
+
+## Call graph (identifiers invoked)
+
+`setDebugTestSink`, `formatLogLine`, `toISOString`, `keys`, `stringify`, `redact`, `toUpperCase`, `emit`, `testSink`, `error`, `appendFileSync`, `createDebugger`, `debug`, `toLowerCase`, `write`, `loadDebugConfig`, `shouldLog`, `getTraceId`
+
+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`.
+