Full-stack Rust Opto-Sync E2E

This repository exercises Opto-Sync on both sides of a Rust application:

• an OptoSyncClient<InMemoryStore> queues an offline mutation and renders its optimistic local view;
• an Axum server exposes the authoritative document over HTTP;
• the server invokes the statically linked syncer.c engine through the official Rust client dependency;
• the test acknowledges the queue only after the network merge succeeds.

A Tokio background worker also drains multiple logical desktop/server lanes in parallel. The integration proof starts that worker before Axum is reachable, then verifies bounded reconnect/replay and convergence of both lane edits into the authoritative document. Replaying a partially applied batch is safe because the OptoSync merge is idempotent.

The complete proof is one process but crosses a real TCP socket. Run it with:

git submodule update --init --recursive
cargo test --locked --all-targets