Remove asserts the types already cover

The nil check burn down added guards which turned out redundant once
the surrounding annotations landed. `_has_handlers` is set to true when
the first handler registers, so it is a boolean rather than the literal
false it was inferred as.

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

exp_scenario/module/gui/player_list.lua

@@ -102,11 +102,11 @@ Elements.reason_confirm = Gui.define("player_list/reason_confirm")
         local action_name = Elements.container.get_selected_action(player)
         local button_data = action_name and config.buttons[action_name]
         if button_data and button_data.reason_callback then
-            local reason = assert(assert(element.parent).entry).text --[[@as string?]]
+            local reason = assert(element.parent).entry.text --[[@as string?]]
             if reason == nil or not reason:find("%S") then reason = "no reason given" end
             button_data.reason_callback(player, reason)
         end
-        assert(assert(element.parent).entry).text = ""
+        assert(element.parent).entry.text = ""
         Elements.container.set_selected_player(player, nil)
         Elements.player_table.refresh_player(player)
     end) --[[@as any]]

exp_scenario/module/gui/quick_actions.lua

@@ -43,7 +43,7 @@ local function new_quick_action(command, on_click)
         :style{
             width = 160,
         }
-        :on_click(on_click or function(def, player, element, event)
+        :on_click(on_click or function(_def, player, _element, _event)
             command(player)
         end)
 

exp_scenario/module/gui/research_milestones.lua

@@ -270,10 +270,9 @@ Elements.container = Gui.define("research_milestones/container")
         local milestone_table = Elements.milestone_table(container)
         Elements.clock_label(header)
 
-        local force = Gui.get_player(parent).force
+        local force = Gui.get_player(parent).force --[[@as LuaForce]]
         def.data[force] = def.data[force] or {} -- used by start index and row data
 
-        local force = Gui.get_player(parent).force --[[@as LuaForce]]
         local start_index = Elements.container.calculate_starting_research_index(force)
         for research_index = start_index, start_index + display_size - 1 do
             local row_data = Elements.milestone_table.calculate_row_data(force, research_index)
@@ -297,7 +296,7 @@ end
 --- @param research_index number
 --- @return number
 function Elements.container.get_achieved_time(force, research_index)
-    return Elements.container.data[force][research_index]
+    return assert(Elements.container.data[force][research_index])
 end
 
 --- Calculate the starting research index for a force

exp_scenario/module/gui/science_production.lua

@@ -109,7 +109,7 @@ function Elements.production_label.calculate_display_data(tooltip, value, cutoff
     end
 
     local suffix, caption = format_number(value)
-    display_data = display_data or {}
+    display_data = display_data or {} --[[@as Elements.production_label.display_data]]
     display_data.caption = caption
     display_data.suffix = suffix
     display_data.tooltip = tooltip
@@ -221,7 +221,7 @@ function Elements.science_table.calculate_row_data(force, science_pack, row_data
     end
 
     -- Return the pack data
-    row_data = row_data or {}
+    row_data = row_data or {} --[[@as ExpGui_ScienceProduction.elements.science_table.row_data]]
     row_data.visible = production.total.made > 0
     row_data.science_pack = science_pack
     row_data.icon_style = icon_style

exp_scenario/module/gui/task_list.lua

@@ -612,7 +612,7 @@ function Elements.confirm_task_button.parse(message)
     -- Trim the spaces of the string
     local trimmed = string.gsub(message, "^%s*(.-)%s*$", "%1")
     local title, body = string.match(trimmed, "(.-)\n(.*)")
-    local parsed = { title = title, body = body }
+    local parsed = { title = title, body = body } --[[@as { title: string, body: string }]]
     if not title then
         -- If it doesn't match the pattern return the str as a title
         parsed.title = trimmed