M2.4: the server decides online (characters, inventory, stats, death, owned graves, per-player saves); death screen with Respawn after 3 s

docs/ROADMAP.md

@@ -47,12 +47,13 @@ Detailed plan in `docs/SURVIVAL_DESIGN.md` (phases M1a–M1d).
 Detailed plan in `docs/MULTIPLAYER_PLAN.md` (hosting on UDP 24242 via Tailscale
 or port forwarding, player identity and names, server rules for co-op/PvP, and
 phases M2.0-M2.7).
-- [ ] Refactor state to server-authoritative (single-player becomes loopback server)
+- [x] Server-authoritative online (single-player stays as it is, with no server) *(M2.4)*
 - [x] Headless dedicated server, joining, identity handshake, names, player list *(M2.1)*
 - [x] ENet transport, player bodies and name tags, local movement checked by the server, interpolation for others *(M2.2)*
 - [x] Replicate resource nodes, pickups, building, chests, fires, doors, clock *(M2.3)*
 - [x] Persistence: world save/load on the server *(M2.3)*
-- [ ] Per-player inventory, stats and saves on the server *(M2.4)*
+- [x] Per-player inventory, stats, death, graves and saves on the server *(M2.4)*
+- [ ] Animals, hunting, fishing and sleeping on the server *(M2.5)*
 - **Done when:** a friend joins your self-hosted server and you build together.
 
 ## M3 — Addon SDK + sandbox · ~2–3 months