Artifact: Sprint and Backlog Plan — Checkout Redesign

Aurora Checkout Redesign -- sprint and backlog plan -- exercises co-07.

Sprint	Committed items	Points	Dependency check
Sprint 1	2.1 Cart persistence rework (8), 1.2 PayPal adapter (5)	13	Neither item has an unmet prerequisite.
Sprint 2	1.1 Stripe adapter (5), 1.3 Apple Pay adapter (3), 2.2 Order summary UI (3), 2.3 Order confirmation email (2)	13	2.2 and 2.3 depend on 2.1, which finished in Sprint 1; 1.1 and 1.3 have no prerequisite.
(Sprint 3, forecast)	3.1 E2E test suite (8), 3.2 Load test (5), 3.3 Feature-flag rollout (2)	15	All three depend on the payment adapters and 2.2, all complete by end of Sprint 2.

Velocity ceiling: 15 points/sprint (three-sprint average). Neither Sprint 1 nor Sprint 2 exceeds it, and no committed task precedes a dependency not scheduled in an earlier sprint.