Zero-erasure incremental constraint scoring for SolverForge.

This crate provides fully-typed incremental scoring infrastructure:

• Zero-erasure incremental constraints (IncrementalUniConstraint, IncrementalBiConstraint, etc.)
• Typed score directors (TypedScoreDirector)
• Tuple-based constraint sets (zero virtual dispatch)

Architecture

All scoring is fully monomorphized - no Box<dyn Trait> in hot paths. Closures are stored as generic type parameters, not Arc<dyn Fn>.