First Join Experience

* Players should spawn at the *reception desk*
* There should be some mechanism that *assigns a team* to each player
* Players should be *guided to their respective bases* (e.g. using signs / HUD / instructions / ...)

The issue names no files, tests, or entry points. Start by locating the existing player-spawn and team-assignment logic, then inspect how players can be guided in-game. Done means new players spawn at the reception desk, receive a team, and can find their assigned base through an implemented guidance mechanism.

Written by the indexing model from the issue text.