Core types and traits for Ancient Greek scansion.

This crate provides the foundational types and abstractions used throughout the scansion system. It is backend-agnostic and contains no ML code.

Architecture

The scansion pipeline follows a machinique (modular assemblage) structure:

Text → Graphemes → Syllables → Feet → Meter
       (char LSTM)  (soft grouping)  (syl LSTM)
                      ↑         ↓
                   [refinement loop]

Unlike strictly hierarchical models, this architecture supports iterative refinement where higher-level structures (feet) can influence lower-level structures (syllables), enabling proper handling of phonological phenomena like synizesis and contextual sound changes.

Each level maintains byte-offset alignment with the original NFC-normalized text.

Invariants

This library maintains strict invariants about byte offsets and text alignment. See the span module for details on how these guarantees are enforced at the type level.