Initial MVP: drivable RX-7 vertical slice + server-authoritative systems

- Rojo + Wally project; ProfileStore (loleris) for safe saves
- Shared: GameConfig, Cars (RX-7 free starter), ProfileTemplate, Remotes
- Server: DataManager, Economy, CarManager, RaceManager, MapBuilder, AntiCheat
- Client: neon HUD + Garage/Dealership UI (buy/equip/upgrade), race/daily
- Procedural Tokyo expressway (spawn pad, finish line, neon pylons, kill walls)
- CI workflow (Gitea/GitHub), Makefile, selene+stylua clean, rojo builds
- Docs: README, GDD, realistic solo ROADMAP

Makefile

@@ -0,0 +1,26 @@
+# Convenience targets. Requires Rokit tools on PATH ($HOME/.rokit/bin).
+.PHONY: install check fmt lint build serve clean
+
+install:
+	rokit install
+	wally install
+
+fmt:
+	stylua src/
+
+check:
+	stylua --check src/
+	selene src/
+	rojo build --output build.rbxl
+
+lint:
+	selene src/
+
+build:
+	rojo build --output build.rbxl
+
+serve:
+	rojo serve
+
+clean:
+	rm -f build.rbxl