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feat: サインインした後に購入をいまのユーザーへ移す syncPurchases を足す - #9
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syncUser は身元を入れ替えるだけなので、前の身元で始めたトライアルは 「購入を復元」を押すまで新しいアカウントに付かなかった。 syncPurchases は Purchases.syncPurchases を包み、何も出さずに購入を移して SubscriptionStatus を返す。起動時の syncUser には組み込まない （既定の transfer behavior で使い捨てのアカウントが購入を奪うため）。 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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何のため
2026-11-01、ごほうび習慣でトライアルを始めた人が2台目の端末でサインインしたところ、
syncUser(userId:)がlogInしかしないため Premium が前の身元に残り、「購入を復元」を押すまで付かなかった。変えたこと
SubscriptionUseCase.syncPurchases()を足した。Purchases.shared.syncPurchases()を包み、UIを出さずに購入をいまの身元へ移し、キャッシュを更新してSubscriptionStatusを返す。失敗はSubscriptionError.userSyncFailedcheckSubscriptionStatus()で答える（既存の準拠はそのままコンパイルが通る）。PreviewSubscriptionUseCaseも実装syncUserには組み込まない。 RevenueCat の transfer behavior は既定で「新しい App User ID へ移す」なので、起動ごとに同期すると入れ直しで作られた使い捨てのアカウントが購入を奪う。呼ぶのは本人が明示的にサインインして uid が変わった時だけ（ドキュメントに明記）確かめたこと
swift build/swift testが通るSyncPurchasesTests：結果のキャッシュ反映・サインイン後に前の身元の購入が付く・syncUserは同期を呼ばない・失敗してもキャッシュは変わらない・既定実装scripts/release.sh --dry-run：bump=minor（3.5.0 → 3.6.0、削除0・追加4）🤖 Generated with Claude Code