feat: replace activity markers with typed sites

tests/jajce_world_scaffold_test.gd

@@ -127,6 +127,19 @@ func _run() -> void:
 		not world.has_node("LegacyActivityMarkers/PantryMarker"),
 		"Pantry should no longer be a legacy activity marker"
 	)
+	_check(
+		not world.has_node("LegacyActivityMarkers"),
+		"JajceWorld should no longer expose legacy activity markers"
+	)
+	var activity_root := world.get_node("WorldObjects/ActivitySites")
+	var activity_ids: Array[String] = []
+	for site in activity_root.get_children():
+		activity_ids.append(String((site as ActivitySite).site_id))
+	activity_ids.sort()
+	_check(
+		activity_ids == ["guard_post", "rest_bench", "study_desk"],
+		"Jajce activity sites should preserve stable semantic IDs"
+	)
 
 	var navigation_region := world.get_node("NavigationRegion3D") as NavigationRegion3D
 	var navigation_map: RID = NavigationServer3D.region_get_map(navigation_region.get_rid())
@@ -143,8 +156,8 @@ func _run() -> void:
 	for resource in resources:
 		destinations.append((resource as ResourceNode).interaction_point.global_position)
 	destinations.append(pantry.get_interaction_position())
-	for marker in world.get_node("LegacyActivityMarkers").get_children():
-		destinations.append((marker as Marker3D).global_position)
+	for site in activity_root.get_children():
+		destinations.append((site as ActivitySite).get_interaction_position())
 
 	for origin in origins:
 		for destination in destinations:
@@ -187,10 +200,15 @@ func _run() -> void:
 		storage_target_position.distance_to(pantry.get_interaction_position()) < 0.01,
 		"Storage actions should use the pantry StorageNode interaction point"
 	)
+	var rest_target := adapter.get_activity_target(SimulationIds.ACTION_REST)
+	_check(
+		rest_target.get("target_id", "") == "rest_bench",
+		"Rest should target the typed RestBench ActivitySite"
+	)
 
 	if failures.is_empty():
 		print(
-			"[TEST] Jajce scaffold passed: Terrain3D, storage site, shader water, building blockouts"
+			"[TEST] Jajce scaffold passed: Terrain3D, storage/activity sites, shader water"
 		)
 		quit(0)
 		return