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/modules/zappier/billing/credit.md

@@ -0,0 +1,44 @@
+# `zappier/billing/credit`
+
+**Package:** `zappier`  
+**Source:** `packages/zappier/src/billing/credit.ts`  
+**Lines:** 20
+
+## What this module is
+
+Implementation module in `zappier`. The tables below are extracted from the source (signatures + JSDoc).
+
+## Exports
+
+`BilledSummary`, `applyMonthlyCredit`
+
+## Types / interfaces / classes
+
+| Kind | Name |
+|------|------|
+| interface | `BilledSummary` |
+
+## Functions
+
+| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
+|------|------------|---------------------|---------|-----------------------------|
+| `applyMonthlyCredit` | `summary: UsageSummary,
+  tier: TierConfig,` | — | `unknown` | see Call graph |
+
+## What it imports / requires
+
+- `../pricing`
+- `../usage`
+
+## Call graph (identifiers invoked)
+
+`applyMonthlyCredit`, `min`
+
+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/modules/zappier/billing/reload.md

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+# `zappier/billing/reload`
+
+**Package:** `zappier`  
+**Source:** `packages/zappier/src/billing/reload.ts`  
+**Lines:** 32
+
+## What this module is
+
+Implementation module in `zappier`. The tables below are extracted from the source (signatures + JSDoc).
+
+## Exports
+
+`stripePaymentClient`, `hasRealStripeKey`
+
+## Types / interfaces / classes
+
+_None extracted._
+
+## Functions
+
+| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
+|------|------------|---------------------|---------|-----------------------------|
+| `stripePaymentClient` | `secretKey: string` | — | `unknown` | see Call graph |
+| `hasRealStripeKey` | `key: string \| undefined` | — | `unknown` | see Call graph |
+|  | _True when the key looks usable (not empty / not the setup placeholder)._ | | | |
+
+## What it imports / requires
+
+- `stripe`
+- `../portal`
+
+## Call graph (identifiers invoked)
+
+`confirms`, `stripePaymentClient`, `async`, `create`, `usable`, `hasRealStripeKey`, `startsWith`
+
+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/modules/zappier/billing/stripe.md

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+# `zappier/billing/stripe`
+
+**Package:** `zappier`  
+**Source:** `packages/zappier/src/billing/stripe.ts`  
+**Lines:** 42
+
+## What this module is
+
+Implementation module in `zappier`. The tables below are extracted from the source (signatures + JSDoc).
+
+## Exports
+
+`METER_EVENT_NAME`, `MeterEventClient`, `computeBillableCents`, `computeDelta`, `reportUsage`
+
+## Types / interfaces / classes
+
+| Kind | Name |
+|------|------|
+| interface | `MeterEventClient` |
+
+## Functions
+
+| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
+|------|------------|---------------------|---------|-----------------------------|
+| `computeBillableCents` | `entries: UsageEntry[], monthlyCreditCents: number` | — | `unknown` | see Call graph |
+|  | _Stripe-side dedup key; events with the same identifier are dropped._ | | | |
+| `computeDelta` | `billableCents: number, previouslyReportedCents: number` | — | `unknown` | see Call graph |
+| `reportUsage` | `client: MeterEventClient,
+  stripeCustomerId: string,
+  entries: UsageEntry[],
+  monthlyCreditCents: number,` | — | `unknown` | see Call graph |
+
+## Methods (class / object)
+
+| Name | Parameters |
+|------|------------|
+| `createMeterEvent` | `params: {
+    eventName: string;
+    customerId: string;
+    value: string;
+    /** Stripe-side dedup key; events with the same identifier are dropped. */
+    identifier?: string;
+  }` |
+
+## What it imports / requires
+
+- `../usage`
+
+## Call graph (identifiers invoked)
+
+`createMeterEvent`, `computeBillableCents`, `reduce`, `max`, `computeDelta`, `ts`, `reportUsage`
+
+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`.
+