feat: implement Diploma screen visual assets and add version-specific blink logic to TownMap

Fix for #1595 #1597 #1589 #1613 and maybe 1520.

tests/engine/diploma_test.lua

@@ -0,0 +1,48 @@
+-- Diploma screen rendering and dismiss tests (engine/events/diploma.asm).
+package.path = "./?.lua;./?/init.lua;" .. package.path
+
+local T = require("tests.modkit")
+local Data = T.fixtures.load()
+
+local S = require("tests.harness").suite("diploma")
+local check, eq = S.check, S.eq
+
+local Game = require("src.core.Game")
+local Input = require("src.core.Input")
+local StateStack = require("src.core.StateStack")
+local SaveData = require("src.core.SaveData")
+local Diploma = require("src.ui.Diploma")
+
+Game.data = Data
+Data.palettes = {
+  palettes = {
+    MEWMON = { {255,255,255}, {180,180,180}, {90,90,90}, {0,0,0} }
+  }
+}
+Game.input = Input; Input:init()
+Game.stack = StateStack; StateStack:init()
+Game.save = SaveData.newGame()
+Game.save.player.name = "ASH"
+require("src.render.Font").load(Data)
+
+local done = false
+local diploma = Diploma.new(Game, function() done = true end)
+Game.stack:push(diploma)
+
+check(diploma.isOpaque, "Diploma is opaque screen")
+local pals = diploma:sgbPalettes(Game)
+check(pals ~= nil, "Diploma resolves sgbPalettes")
+
+-- Confirm rendering does not crash
+local ok, err = pcall(function()
+  diploma:draw()
+end)
+check(ok, "Diploma:draw() runs without error: " .. tostring(err))
+
+-- Confirm dismissal on A or B press
+Input.pressed = { a = true }
+diploma:update()
+check(done, "Diploma calls onDone on A press")
+eq(Game.stack:top(), nil, "Diploma pops from stack")
+
+S.finish()