Module log 

Reference in-memory transparency log (RFC-ACDP-0012) — an append-only RFC 6962-style Merkle tree over publish-event leaves.

MerkleLog is a building block, deliberately not wired into crate::registry::RegistryServer or the store: real registries (the separate acdp-registry-* crates) own the §7.1 atomicity rule — body, receipt, and leaf commit together, or none does — and the §8 endpoint surface. What this type provides is the tree arithmetic and the signed artifacts:

• MerkleLog::append — one accepted publish → one leaf, forever, leaf_index assigned consecutively from 0 in acceptance order (§5.3, §7.1 rule 2);
• MerkleLog::checkpoint / MerkleLog::checkpoint_at — signed tree heads under the RFC-ACDP-0010 receipt signing key (§6);
• MerkleLog::inclusion_proof — RFC 6962 §2.1.1 audit paths packaged as LogInclusion (§8.2 inclusion mode);
• MerkleLog::consistency_proof — RFC 6962 §2.1.2 proofs (§8.2 consistency mode).

Everything a checkpoint commits to is recomputable from the ordered leaf hashes alone (§8.3), so the in-memory representation is exactly that: the leaves plus their §5.1 hashes.

Structs

MerkleLog

An append-only, in-memory RFC 6962-style Merkle tree over transparency-log leaves (RFC-ACDP-0012 §5).