feat: add local fixture pricing provider

docs/IMPLEMENTATION-STATUS.md

@@ -153,6 +153,7 @@ Work through one bounded vertical slice at a time. The linked documentation rema
 - Pricing refresh requests now enqueue seller-scoped jobs and expose a safe `GET /api/v1/admin/jobs/:id` polling contract instead of doing provider work inline.
 - Product-level provider mappings now persist seller-scoped `PRODUCT`/`SEARCH` relationships and support active listing and controlled disabling.
 - Pricing refresh enqueue now resolves its provider from an active Product mapping and rejects unmapped Products explicitly.
+- Local development and CI can enable a deterministic fixture provider for end-to-end refresh coverage; production provider adapters remain explicitly configured deployment boundaries.
 - `npm install` currently reports dependency audit findings. Review and remediate them before production deployment; do not use `npm audit fix --force` without reviewing its changes.
 
 ## Local Commands

docs/PRICING.md

@@ -28,6 +28,11 @@ pricing service, and recalculates the item valuation. Missing providers return
 an explicit unavailable response; the application never fabricates observations
 or values.
 
+Local development and CI may enable the deterministic `fixture-provider` with
+`PRICING_FIXTURE_PROVIDER_ENABLED=true`. It exists only for repeatable
+workflow/testing coverage and is disabled by default; production deployments
+must register an approved external adapter instead.
+
 Use officially supported APIs or permitted sources. Do not invent APIs or bypass restrictions.
 
 ## Provider Product Mapping