Narrow the remaining position, box and colour reads

Color.struct leaves every channel optional, so the rainbow command
declares its own fully populated colour.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

exp_scenario/module/commands/protected_entities.lua

@@ -37,7 +37,7 @@ end
 
 --- Get the key used in protected_areas
 --- TODO expose this from EntityProtection
---- @param area BoundingBox
+--- @param area ExpUtil_AABB.Box
 --- @return string
 local function get_area_key(area)
     return format_string("%i,%i", floor(area.left_top.x), floor(area.left_top.y))
@@ -49,13 +49,15 @@ end
 local function show_protected_entity(player, entity)
     local key = get_entity_key(entity)
     if renders[player.index][key] then return end
-    local rb = entity.selection_box.right_bottom
+    local selection_box = entity.selection_box --[[@as ExpUtil_AABB.Box]]
+    local rb = selection_box.right_bottom
+    local position = entity.position --[[@as MapPosition.struct]]
     renders[player.index][key] = rendering.draw_sprite{
         sprite = "utility/notification",
         target = entity,
         target_offset = {
-            (rb.x - entity.position.x) * 0.75,
-            (rb.y - entity.position.y) * 0.75,
+            (rb.x - position.x) * 0.75,
+            (rb.y - position.y) * 0.75,
         },
         x_scale = 2,
         y_scale = 2,
@@ -67,7 +69,7 @@ end
 --- Show a protected area to a player
 --- @param player LuaPlayer
 --- @param surface LuaSurface
---- @param area BoundingBox
+--- @param area ExpUtil_AABB.Box
 local function show_protected_area(player, surface, area)
     local key = get_area_key(area)
     if renders[player.index][key] then return end

exp_scenario/module/commands/rainbow.lua

@@ -6,6 +6,12 @@ local Commands = require("modules/exp_commands")
 local format_player_name = Commands.format_player_name_locale
 local format_text = Commands.format_rich_text_color
 
+--- A colour with every channel set, Color.struct leaves them optional
+--- @class ExpCommands_Rainbow.Color
+--- @field r number
+--- @field g number
+--- @field b number
+
 --- Wraps one component into the next
 --- @param c1 number
 --- @param c2 number
@@ -21,8 +27,8 @@ local function step_component(c1, c2)
 end
 
 --- Wraps all components of a colour ensuring it remains valid
---- @param color Color
---- @return Color
+--- @param color ExpCommands_Rainbow.Color
+--- @return ExpCommands_Rainbow.Color
 local function step_color(color)
     color.r, color.g = step_component(color.r, color.g)
     color.g, color.b = step_component(color.g, color.b)
@@ -32,9 +38,9 @@ local function step_color(color)
 end
 
 --- Get the next colour in the rainbow by the given step
---- @param color Color
+--- @param color ExpCommands_Rainbow.Color
 --- @param step number
---- @return Color
+--- @return ExpCommands_Rainbow.Color
 local function next_color(color, step)
     step = step or 0.1
     local new_color = { r = 0, g = 0, b = 0 }