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/db/pricing-store.md

@@ -0,0 +1,55 @@
+# `zappier/db/pricing-store`
+
+**Package:** `zappier`  
+**Source:** `packages/zappier/src/db/pricing-store.ts`  
+**Lines:** 107
+
+## What this module is
+
+Implementation module in `zappier`. The tables below are extracted from the source (signatures + JSDoc).
+
+## Exports
+
+`SqlitePricingStore`
+
+## Types / interfaces / classes
+
+| Kind | Name |
+|------|------|
+| class | `SqlitePricingStore` |
+
+## Functions
+
+_No top-level functions extracted._
+
+## Methods (class / object)
+
+| Name | Parameters |
+|------|------------|
+| `constructor` | `private db: Database.Database,
+    seedCard: RateCard = DEFAULT_RATE_CARD,
+    seedTiers: 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
+
+- `better-sqlite3`
+- `../pricing`
+
+## Call graph (identifiers invoked)
+
+`constructor`, `exec`, `price_endpoints`, `tiers`, `prepare`, `get`, `entries`, `upsertEndpoint`, `upsertTier`, `getRateCard`, `all`, `parse`, `getTiers`, `map`, `run`, `stringify`, `deleteEndpoint`, `deleteTier`
+
+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`.
+