Module registry 

Global endpoint registry shared by all FFI adapters.

Centralises the Slab<IrohEndpoint> that was previously triplicated across Node, Deno, and Tauri adapters. Handles are u64, consistent with stream handles from slotmap.

Functions

close_all_endpoints

Drain the entire registry and force-close every endpoint.

get_endpoint

Look up an endpoint by handle (cheap Arc clone).

insert_endpoint

Insert an endpoint into the global registry and return its handle.

remove_endpoint

Remove an endpoint from the registry, returning it if it existed.