TPG.PlayerTeams.AssignPlayer

Move a player onto a team, subject to the switch cooldown and balance check. A no-op (returns true without touching the cooldown) if they are already on teamId. Otherwise: voluntary switches onto an actual team (not spectator) are throttled by TPG.Config.teamSwitchCooldown, which admins bypass and which only applies once the player has switched at least once before (ply.tpgLastTeamSwitch unset on first join). Leaving to spectator is always allowed and never stamps the cooldown. Passing the cooldown still requires CanJoin to allow the move; either rejection sends a chat message and returns false without moving the player. On success this also respawns the player and applies team colour via the normal spawn path.