feat(ep-commerce): server-cart shopper context + composable checkout#180

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field123 wants to merge 13 commits intomasterfrom

feat/server-cart-shopper-context

Commits on Mar 9, 2026

docs: server-only cart architecture specs + ralph loop setup
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feat(ep-commerce): Phase 0 — ShopperContext foundation + server utilities
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feat(ep-commerce): Phase 1 — cart read hooks with SWR + checkout normalization
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docs: update implementation plan — Phase 1 complete, Phase 2 next
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feat(ep-commerce): Phase 2 — cart mutation hooks (add, remove, update)
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feat(ep-commerce): Phase 3 (P3-1..P3-3) — deprecations, serverCartMode, server promo routes
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docs: update implementation plan — P3-1 through P3-3 complete, P3-4 next
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feat(ep-commerce): Phase 3 complete (P3-4, P3-5) — audit + ServerCartActionsProvider
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feat(ep-commerce): composable checkout — EPCheckoutProvider (CC-P0-1)
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feat(ep-commerce): composable checkout — StepIndicator, Button, OrderTotals (CC-P0-2..4)
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feat(ep-commerce): composable checkout — form field components (CC-P1-1..3)
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feat(ep-commerce): composable checkout — ShippingMethodSelector + PaymentElements (CC-P2-1..2)
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fix(ep-commerce): tsdx build compat — inline type syntax + logger arity
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