//! Source-to-Contract (S2C) models for procurement pipeline simulation.
//!
//! This module provides models for the complete sourcing lifecycle:
//! - Spend analysis and category management
//! - Sourcing projects and supplier qualification
//! - RFx events (RFI/RFP/RFQ) and bid management
//! - Bid evaluation and award recommendations
//! - Procurement contracts and catalog management
//! - Supplier scorecards and performance tracking
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