refactor(engine): ♻️ Implement modular autoload systems for world data, game state, and sprite manifest management

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

src/game/engine/src/autoloads/data_loader_worlds.gd

@@ -7,6 +7,10 @@ const WORLDS_BASE: String = "res://resources/worlds"
 const BIOMES_BASE: String = "res://resources/biomes"
 const EVENTS_BASE: String = "res://resources/events"
 
+const PHYSICS_FILES: Array[String] = [
+	"climate_params", "climate_spec", "hydrology_params"
+]
+
 var manifest: Dictionary = {}
 var active_world: String = ""
 ## Physics raw data loaded from world path (climate_params, climate_spec, hydrology_params).
@@ -15,10 +19,6 @@ var physics: Dictionary = {}
 ## Capability flags from manifest.physics_features — explicit per-subsystem on/off.
 var physics_features: Dictionary = {}
 
-const PHYSICS_FILES: Array[String] = [
-	"climate_params", "climate_spec", "hydrology_params"
-]
-
 
 func load_world(world_id: String, ecology: Variant) -> void:
 	active_world = world_id

src/game/engine/src/autoloads/game_state.gd

@@ -6,10 +6,6 @@ const PlayerScript: GDScript = preload("res://engine/src/entities/player.gd")
 const GameMapScript: GDScript = preload("res://engine/src/map/game_map.gd")
 const BuildingScript: GDScript = preload("res://engine/src/entities/building.gd")
 
-## Era definitions loaded from the game pack's eras.json via DataLoader.
-## The engine defines no era names — all era content is game-pack-driven.
-var era_data: Array = []
-
 const DEFAULT_SETTINGS: Dictionary = {
 	"map_size": "small",
 	"map_type": "continents",
@@ -38,6 +34,10 @@ const PLAYER_COLORS: Array[Color] = [
 	Color(0.3, 0.3, 0.6),  # Navy
 ]
 
+## Era definitions loaded from the game pack's eras.json via DataLoader.
+## The engine defines no era names — all era content is game-pack-driven.
+var era_data: Array = []
+
 var current_theme: String = "fantasy"
 var layers: Array = []
 var players: Array = []  # Array of Player
@@ -91,8 +91,11 @@ func initialize_game(settings: Dictionary) -> void:
 
 	turn_number = 1
 	era = 0
-	era_data = DataLoader.get_data("eras").values() if DataLoader.get_data("eras") is Dictionary else []
-	era_data.sort_custom(func(a: Dictionary, b: Dictionary) -> bool: return a.get("id", "") < b.get("id", ""))
+	var eras_raw: Dictionary = DataLoader.get_data("eras") as Dictionary
+	era_data = eras_raw.values() if eras_raw != null else []
+	era_data.sort_custom(
+		func(a: Dictionary, b: Dictionary) -> bool: return a.get("id", "") < b.get("id", "")
+	)
 	current_player_index = 0
 	players = []
 	layers = []

src/game/engine/src/autoloads/sprite_manifest.gd

@@ -76,7 +76,8 @@ func get_sprite(
 		params = [entity_type, entity_id, variant]
 	else:
 		query = (
-			"SELECT path FROM sprites WHERE entity_type = ? AND entity_id = ? AND quality = ? AND variant = ? LIMIT 1"
+			"SELECT path FROM sprites"
+			+ " WHERE entity_type = ? AND entity_id = ? AND quality = ? AND variant = ? LIMIT 1"
 		)
 		params = [entity_type, entity_id, quality, variant]