public protocol AIService: Sendable {
    func planSongProject(from request: SongPlanningRequest) async throws -> SongPlanningDraft
}

public struct SongPlanningRequest: Equatable, Sendable {
    public let userIntent: String

    public init(userIntent: String) {
        self.userIntent = userIntent
    }
}

public struct SongPlanningDraft: Equatable, Sendable {
    public let summary: String

    public init(summary: String) {
        self.summary = summary
    }
}