feat(lobby): move lobby plugin to pkg/plugin and streamline the initialization function

pkg/lobby/component/lobby.go → pkg/plugin/lobby/component/lobby.go

@@ -27,12 +27,22 @@ func (PlayerComponent) Name() string { return "player" }
 
 // Team represents a team within a lobby.
 type Team struct {
+	// TeamID is the stable identifier used to reference this team in all
+	// commands and events. Server-assigned at lobby creation from the
+	// preset registry and immutable afterward.
 	TeamID     string   `json:"team_id"`
-	Name       string   `json:"name"`
 	PlayerIDs  []string `json:"player_ids"` // References to player IDs (source of truth)
 	MaxPlayers int      `json:"max_players"`
 }
 
+// TeamConfig is a creation-time team specification used inside a lobby preset.
+// Server operators declare presets in lobby.Config.LobbyPresets; clients choose
+// a preset by name on CreateLobbyCommand. MaxPlayers <= 0 means unlimited.
+type TeamConfig struct {
+	TeamID     string `json:"team_id"`
+	MaxPlayers int    `json:"max_players"`
+}
+
 // Session represents the current session state of a lobby.
 type Session struct {
 	State           SessionState   `json:"state"`
@@ -97,16 +107,6 @@ func (l *LobbyComponent) GetTeam(teamID string) *Team {
 	return nil
 }
 
-// GetTeamByName returns a team by its name.
-func (l *LobbyComponent) GetTeamByName(name string) *Team {
-	for i := range l.Teams {
-		if l.Teams[i].Name == name {
-			return &l.Teams[i]
-		}
-	}
-	return nil
-}
-
 // HasPlayer returns true if the player is in any team.
 func (l *LobbyComponent) HasPlayer(playerID string) bool {
 	for _, team := range l.Teams {
@@ -428,6 +428,12 @@ type ConfigComponent struct {
 	// start itself and returns to Idle. Values <= 0 disable timeout
 	// enforcement entirely.
 	MaxAllocationTimeout int64 `json:"max_allocation_timeout,omitempty"`
+
+	// LobbyPresets is the server-owned registry of team configurations
+	// that clients can reference by label in CreateLobbyCommand.Preset.
+	// Server is the source of truth for team caps; clients cannot supply
+	// arbitrary TeamConfig values.
+	LobbyPresets map[string][]TeamConfig `json:"lobby_presets,omitempty"`
 }
 
 // Name returns the component name for ECS registration.

pkg/lobby/component/lobby_internal_test.go → pkg/plugin/lobby/component/lobby_internal_test.go

@@ -39,14 +39,14 @@ func TestLobbyComponent_GetTeam(t *testing.T) {
 
 	lobby := &LobbyComponent{
 		Teams: []Team{
-			{TeamID: "team1", Name: "Team One"},
-			{TeamID: "team2", Name: "Team Two"},
+			{TeamID: "team1"},
+			{TeamID: "team2"},
 		},
 	}
 
 	team := lobby.GetTeam("team1")
 	require.NotNil(t, team)
-	assert.Equal(t, "Team One", team.Name)
+	assert.Equal(t, "team1", team.TeamID)
 
 	assert.Nil(t, lobby.GetTeam("unknown"))
 }

pkg/lobby/lobby_test.go → pkg/plugin/lobby/lobby_test.go

@@ -5,7 +5,7 @@ import (
 
 	"github.com/argus-labs/world-engine/pkg/cardinal"
 	"github.com/argus-labs/world-engine/pkg/cardinal/snapshot"
-	"github.com/argus-labs/world-engine/pkg/lobby"
+	"github.com/argus-labs/world-engine/pkg/plugin/lobby"
 	"github.com/stretchr/testify/require"
 )
 

pkg/lobby/plugin.go → pkg/plugin/lobby/plugin.go

@@ -30,8 +30,8 @@ package lobby
 
 import (
 	"github.com/argus-labs/world-engine/pkg/cardinal"
-	"github.com/argus-labs/world-engine/pkg/lobby/component"
-	"github.com/argus-labs/world-engine/pkg/lobby/system"
+	"github.com/argus-labs/world-engine/pkg/plugin/lobby/component"
+	"github.com/argus-labs/world-engine/pkg/plugin/lobby/system"
 )
 
 // Re-export types for easier user access.
@@ -63,6 +63,7 @@ type (
 	UpdatePlayerPassthroughCommand  = system.UpdatePlayerPassthroughCommand
 	GetPlayerCommand                = system.GetPlayerCommand
 	GetAllPlayersCommand            = system.GetAllPlayersCommand
+	GetLobbyCommand                 = system.GetLobbyCommand
 
 	// Events (Broadcast).
 	CreatedEvent                   = system.LobbyCreatedEvent
@@ -95,6 +96,7 @@ type (
 	UpdatePlayerPassthroughResult  = system.UpdatePlayerPassthroughResult
 	GetPlayerResult                = system.GetPlayerResult
 	GetAllPlayersResult            = system.GetAllPlayersResult
+	GetLobbyResult                 = system.GetLobbyResult
 
 	// Cross-Shard Commands.
 	NotifySessionStartCommand = system.NotifySessionStartCommand
@@ -139,6 +141,14 @@ type Config struct {
 	// Clients should send heartbeats more frequently than this (e.g., every timeout/3 seconds).
 	// Default: 30 seconds.
 	HeartbeatTimeout int64
+
+	// LobbyPresets is the server-owned registry of team configurations
+	// that clients can reference by label in CreateLobbyCommand.Preset.
+	// The map key is the preset label; the value is the ordered list of
+	// teams that a lobby created with that preset will contain. Server
+	// operators are the source of truth for team caps; clients cannot
+	// supply arbitrary team configurations.
+	LobbyPresets map[string][]TeamConfig
 }
 
 // Plugin implements cardinal.Plugin for the lobby system.
@@ -160,6 +170,7 @@ func (p *Plugin) Register(world *cardinal.World) {
 		HeartbeatTimeout:     p.config.HeartbeatTimeout,
 		AssignmentAuthority:  p.config.AssignmentAuthority,
 		MaxAllocationTimeout: p.config.MaxAllocationTimeout,
+		LobbyPresets:         p.config.LobbyPresets,
 	})
 
 	// Store provider