rig-memory

Saved conversations for Rig: recent messages, compaction, and sessions saved as JSON-lines logs (rig-session/4) that can be resumed, rewritten, and an agent's log forked up to a turn boundary. With default features it is pure data and builds for wasm32; feature fs adds DirStore and DirFiles. load_async and save_async keep a conversation in any AsyncStore, such as a database or IndexedDB, and every local store is one; rig-agent's AgentBuilder::memory keeps an agent's conversation there. A store appends to a log only if the log is still as long as the writer read it, checking and appending in one step, so of two saves that read one log the second is refused. See the crate docs for the API.