//! graph section codecs (chunk-to-chunk csr adjacency and, later, the
//! entity/property-graph sections). all are OPTIONAL and EXCLUDED from
//! content_hash, additive within frozen format v1, and never touch the
//! embedding hot path. G1 ships only `adjacency` (SECTION_GRAPH_ADJACENCY,
//! 0x0C); the entity sections (0x11..=0x13) land in G2.
pub use ;