//! Integrity primitives (ADR-0011, ยง33): logical content hashes, physical
//! record integrity, root integrity.
//!
//! The three concepts are deliberately distinct:
//!
//! - [`content`] โ logical content hash: BLAKE3 over materialized bytes;
//! identical for different physical representations of the same bytes.
//! - [`record`] โ physical record integrity: envelope CRC32C + embedded
//! content id of the stored payload.
//! - [`root`] โ root integrity: the superblock-to-root-object binding and
//! generation agreement.
//!
//! fsck composes all three into the full validation chain.