- Adds optional `changeFromQuantity` field to inventory mutations for compare‑and‑swap concurrency protection.
- Mutations will error with `CHANGE_FROM_QUANTITY_STALE` if the current quantity doesn't match, preventing stale overwrites; passing null disables the check.
- Supported on inventoryAdjustQuantities, inventoryMoveQuantities, inventorySetOnHandQuantities, and productVariantsBulkUpdate (public in version 2026-01).
New `changeFromQuantity` field to manage inventory
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