Spectator mode: watch ongoing race after finishing or DNF

Description

Players who finish a race early or disconnect/did-not-finish (DNF) currently have nothing to do while waiting for others to complete. A spectator mode lets them watch the remaining race from a free-camera or follow-player perspective.

Acceptance Criteria

• After crossing the finish line, player is automatically transitioned to spectator mode
• Spectator can cycle through active racers (next/prev player keybind via interaction)
• Spectator HUD shows: currently watched player name, their score, position in standings
• Spectators are invisible to racing players and cannot interfere with collision detection
• Spectator mode ends and player returns to lobby when the race ends
• Late-join players (joining after race has started) also enter spectator mode directly
• Unit test: spectator entity has no CollisionComponent, no BoostComponent

Technical Details

• New SpectatorComponent marker component on the player ECS entity
• CollisionSystem must skip entities with SpectatorComponent
• Use Minestom spectator gamemode and camera API

Dependencies

• Live standings scoreboard (players need to be able to see who they're spectating)

Estimate

M

Start by tracing the player ECS entity and CollisionSystem, then review Minestom’s spectator gamemode and camera API. Add the SpectatorComponent and connect race-finish, DNF, and late-join transitions, while using the live standings scoreboard for watched-player details. Done means the listed spectator behavior works and the unit test confirms spectator entities lack CollisionComponent and BoostComponent.