backbone-mailing 0.4.0

Email marketing — mass-mail engine: audiences, subscriptions, hand-set mailing lifecycle, seeded A/B testing, per-recipient traces, cycle-44 bridge targets (Odoo mass_mailing port)
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mod mailing_state_state_machine;
mod trace_status_state_machine;

/// Shared error type for all state machines in this module
#[derive(Debug, Clone, thiserror::Error)]
pub enum StateMachineError {
    #[error("Invalid state: {0}")]
    InvalidState(String),

    #[error("Invalid transition: {0}")]
    InvalidTransition(String),

    #[error("Transition '{transition}' not allowed from state '{from}'")]
    TransitionNotAllowed {
        transition: String,
        from: String,
    },

    #[error("Role '{role}' not authorized for transition '{transition}'")]
    RoleNotAuthorized {
        role: String,
        transition: String,
    },

    #[error("Guard condition failed for transition '{0}'")]
    GuardFailed(String),

    #[error("Cannot transition from final state '{0}'")]
    FinalStateReached(String),
}

pub use mailing_state_state_machine::{mailing_stateState, mailing_stateTransition, mailing_stateStateMachine};
pub use trace_status_state_machine::{trace_statusState, trace_statusTransition, trace_statusStateMachine};