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/pricing.md

@@ -0,0 +1,78 @@
+# `zappier/pricing`
+
+**Package:** `zappier`  
+**Source:** `packages/zappier/src/pricing.ts`  
+**Lines:** 171
+
+## What this module is
+
+Implementation module in `zappier`. The tables below are extracted from the source (signatures + JSDoc).
+
+## Exports
+
+`PriceRule`, `TierConfig`, `RateCard`, `TierCatalog`, `ConfigTierCatalog`, `CallUsage`, `Quote`, `PricingContext`, `PricingStore`, `DEFAULT_RATE_CARD`, `DEFAULT_TIERS`, `DEFAULT_PRICING`, `InMemoryPricingStore`, `quoteCall`
+
+## Types / interfaces / classes
+
+| Kind | Name |
+|------|------|
+| interface | `TierConfig` |
+| interface | `RateCard` |
+| interface | `TierCatalog` |
+| interface | `CallUsage` |
+| interface | `Quote` |
+| interface | `PricingContext` |
+| interface | `PricingStore` |
+| type | `PriceRule` |
+| class | `ConfigTierCatalog` |
+| class | `InMemoryPricingStore` |
+
+## Functions
+
+| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
+|------|------------|---------------------|---------|-----------------------------|
+| `quoteCall` | `pricing: PricingContext,
+  tierId: string,
+  endpointId: string,
+  usage: CallUsage,
+  multiplierOverride?: number,` | — | `unknown` | see Call graph |
+
+## Methods (class / object)
+
+| Name | Parameters |
+|------|------------|
+| `find` | `id: string` |
+| `list` | `(none)` |
+| `constructor` | `private tiers: TierConfig[]` |
+| `find` | `id: string` |
+| `list` | `(none)` |
+| `getRateCard` | `(none)` |
+| `getTiers` | `(none)` |
+| `upsertEndpoint` | `endpointId: string, rule: PriceRule` |
+| `deleteEndpoint` | `endpointId: string` |
+| `upsertTier` | `tier: TierConfig` |
+| `deleteTier` | `tierId: string` |
+| `constructor` | `rateCard: RateCard = DEFAULT_RATE_CARD, tiers: TierConfig[] = DEFAULT_TIERS` |
+| `getRateCard` | `(none)` |
+| `getTiers` | `(none)` |
+| `upsertEndpoint` | `endpointId: string, rule: PriceRule` |
+| `deleteEndpoint` | `endpointId: string` |
+| `upsertTier` | `tier: TierConfig` |
+| `deleteTier` | `tierId: string` |
+
+## What it imports / requires
+
+_No imports detected._
+
+## Call graph (identifiers invoked)
+
+`find`, `list`, `constructor`, `getRateCard`, `getTiers`, `upsertEndpoint`, `deleteEndpoint`, `upsertTier`, `deleteTier`, `findIndex`, `push`, `filter`, `quoteCall`, `ceil`, `round`
+
+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`.
+