Scope cut: drive-only MVP (remove racing + economy)

Per user direction, the MVP is now simply driving cars on the expressway.
- Removed RaceManager and Economy modules entirely
- Slimmed Remotes to DataUpdated / SpawnCar / EquipCar
- ProfileTemplate now just remembers the last driven car (v2)
- Cars: dropped price/rep/upgrade fields; kept identity + driving stats
- CarManager: stat-based tuning only; RX-7 allowlist via GameConfig.canDrive
- DataManager: assign default car on join; downgrade RX-7 if de-allowlisted
- Client: replaced garage/economy UI with a simple car picker + respawn
- Docs: GDD/ROADMAP/README rewritten for drive-only; added docs/MESH_SWAP.md
- Gates: stylua clean, selene 0/0, rojo builds

docs/GDD.md

@@ -1,52 +1,38 @@
 # Game Design Document — Fast & Furious: Tokyo Expressway (MVP)
 
 ## Vision
-A progression-fantasy street racer. You start in a humble-but-iconic 1993 Mazda
-RX-7 and claw your way up to hypercars on a neon-drenched Tokyo expressway at night.
-Easy to pick up, satisfying to grind, fair to spend on.
+A neon Tokyo expressway you can cruise at night in cool cars — starting with a
+real 1993 Mazda RX-7. The long-term dream is a full street-racing simulator, but
+the **MVP is deliberately tiny: just drive.**
 
-## The one-sentence pitch
-"Start in the RX-7, own the expressway."
+## MVP scope (what's built) — JUST DRIVING
+- Spawn on a neon Tokyo expressway at night.
+- Drive a car around the highway (built on Roblox's reliable VehicleSeat).
+- Switch between cars via a simple "CARS" picker.
+- Respawn your car if you flip or fall off.
+- The **RX-7 is demo-locked** to the owner + son (Roblox UserId allowlist,
+  enforced server-side). Everyone else drives the public cars.
+- Your last car is remembered between sessions (ProfileStore).
 
-## Core loop (the addictive 60 seconds)
-1. **Spawn** on the expressway in your equipped car.
-2. **Race** the time-trial down the highway to the finish line.
-3. **Earn** cash + reputation for finishing.
-4. **Spend** in the Garage: upgrade your current car or buy the next tier.
-5. A faster car / better tune makes the next race feel better → back to step 1.
+That's it. No racing, no money, no rep, no upgrades, no daily rewards. The point
+of the MVP is to get the car feeling good on the road and be testable fast.
 
-Daily rewards + rising rep gates give a reason to come back tomorrow.
+## Why this cut
+Driving feel is the hardest, most important part of a car game. Everything else
+(racing, economy, progression) is worthless if the car isn't fun to drive. So the
+MVP nails driving first; the rest is layered on later once it feels right.
 
-## Pillars
-- **Progression fantasy** — junker → hypercar, always a visible next goal.
-- **Nighttime Tokyo vibe** — neon, speed, style.
-- **Fair monetization** — spending accelerates the grind, never buys wins.
-- **Server-authoritative** — no exploiting money or unlocking cars.
+## Pillars (for the eventual full game)
+- Progression fantasy — junker → hypercar (LATER).
+- Nighttime Tokyo vibe — neon, speed, style (NOW: the map).
+- Fair monetization (LATER).
+- Server-authoritative — no exploiting (NOW: allowlist + anti-cheat foundations).
 
-## MVP feature set (what's built)
-- 5-tier car catalogue; **RX-7 is the free starter** (Tier 2).
-- Drivable cars via VehicleSeat (proven, swap-in real mesh later).
-- Procedural expressway map with kill-walls (can't leave the road).
-- Garage + Dealership UI: view / buy / equip / upgrade.
-- Upgrade system: Engine / Tires / Nitro, cost-scaled with diminishing returns.
-- Solo time-trial race with server-validated payouts.
-- Reputation gates on higher-tier cars.
-- Daily login reward.
-- Robust saving via ProfileStore (session-locked, reconciling).
-- Basic movement anti-cheat.
+## Deferred (see ROADMAP)
+Racing, checkpoints, money/economy, reputation, upgrades, customization, daily
+rewards, traffic AI, leaderboards, monetization, crews/PvP, full city map.
 
-## Deliberately deferred (see ROADMAP)
-Traffic AI, head-to-head/drag racing, car customization cosmetics, crews/PvP,
-full city map, mobile-tuned optimization pass, monetization products.
-
-## Economy first-pass numbers (tune freely in `GameConfig`)
-- Start: $1,500, 0 rep, own the RX-7.
-- Race finish: +$650 (base+win) and +15 rep.
-- Daily: +$300, +10 rep.
-- Upgrades: base $500, ×1.6 per level, cap level 5 per part.
-- Car tiers: Junk $800 → S15 $12k (50 rep) → R34 $45k (180 rep) → Hyper $250k (600 rep).
-
-## Win condition / retention
-No hard "end" — the chase up the tiers plus daily rewards and (future) leaderboards
-supply the long tail. First-session goal: earn enough to feel one upgrade land
-inside the first 10 minutes.
+## Cars in the picker
+RX-7 (restricted), City Runabout (public default), Silvia S15, Skyline GT-R R34,
+and a stylized hypercar. Stats (Speed/Accel/Handling, 0-100) only affect driving
+feel — there are no prices or unlocks in the MVP.