Authoritative multiplayer game skeleton in Rust.

• crates/protocol: shared wire protocol types
• crates/shared: deterministic game simulation logic
• crates/server: authoritative tick-based server
• crates/client: terminal client for sending movement input

Start server:

cargo run -p server

Start one or more clients in separate terminals:

PLAYER_NAME=alice cargo run -p client
PLAYER_NAME=bob cargo run -p client

In each client, type controls and press enter: w, a, s, d, wa, etc.

• Server uses a fixed 20hz simulation tick.
• Client input includes sequence numbers.
• Server snapshots include last_processed_input for reconciliation plumbing.