import Foundation enum ClaudeOAuthUsageRateLimitGate {    private static let blockedUntilKey = "claudeOAuthUsageRateLimitBlockedUntilV1"    private static let defaultCooldown: TimeInterval = 60 * 5     static func blockedUntil(        interaction: ProviderInteraction = ProviderInteractionContext.current,        now: Date = Date()) -> Date?    {        guard interaction != .userInitiated else { return nil }        return self.currentBlockedUntil(now: now)    }     static func currentBlockedUntil(now: Date = Date()) -> Date? {        guard let raw = UserDefaults.standard.object(forKey: self.blockedUntilKey) as? Double else {            return nil        }         let blockedUntil = Date(timeIntervalSince1970: raw)        guard blockedUntil > now else {            UserDefaults.standard.removeObject(forKey: self.blockedUntilKey)            return nil        }        return blockedUntil    }     static func recordRateLimit(retryAfter: Date?, now: Date = Date()) {        let blockedUntil = if let retryAfter, retryAfter > now {            retryAfter        } else {            now.addingTimeInterval(self.defaultCooldown)        }        UserDefaults.standard.set(blockedUntil.timeIntervalSince1970, forKey: self.blockedUntilKey)    }     static func recordSuccess() {        UserDefaults.standard.removeObject(forKey: self.blockedUntilKey)    }     #if DEBUG    static func resetForTesting() {        UserDefaults.standard.removeObject(forKey: self.blockedUntilKey)    }    #endif}