[paales]

New module GraphQlCatalogInventory adds ProductInterface.stock_sources: [ProductStockSource!]!.

• What it lists: the source items of the product in the enabled sources of the website's stock, in source priority order.
• Each entry: source_code, name, quantity, in_stock (the source item status), is_pickup_location (MSI in-store pickup, when that module is installed), latitude, longitude, postcode, city and country_code.
• Quantity: it is the physical quantity. Reservations count on the stock only, so it is not the salable quantity. The field description says so.
• Products without source items: a configurable product, for example, answers an empty list.
• Resolver: Model/Resolver/StockSources is a batch resolver. One source item search covers every product of the request.

Validated:

• Unit tests: pass, including StockSourcesTest: priority order, a disabled source left out, and a product without items.
• Parity: with the matching CatalogStorefront branch, the gate is 29 of 29 identical, 8 skipped. The new query 37-stock-sources covers simples, a configurable product and a child.
• Core path cost: one source item search for the page.

This branch also contains the followFilters commit, which is already on main through #1, so the diff shows the inventory module only.

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https://claude.ai/code/session_019nYtEbdpZ5P5wLAoCfD4MX

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