hashtree-index

Content-addressed B-tree indexes for hashtree.

The crate builds deterministic index trees on top of hashtree-core, so index roots can be stored, replicated, and compared the same way as file trees.

Current uses include:

• key/value lookup over immutable tree roots
• link indexes that point directly at content-addressed blobs
• cross-language index interoperability with the TypeScript implementation

Part of hashtree.