Icons: game-icons.net glyphs tinted per tier, built into one sprite

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_game.py

@@ -995,5 +995,15 @@ class HappeningsTest(unittest.TestCase):
         self.assertIsNotNone(world["next_fortune_at"])
 
 
+
+class IconTest(unittest.TestCase):
+    def test_everything_has_a_glyph_in_the_sprite(self):
+        sprite = (Path(__file__).resolve().parent.parent / "static" / "icons.svg").read_text()
+        missing = [name for name in game.all_glyphs() if f'id="{name}"' not in sprite]
+        self.assertEqual(missing, [], "run tools/build_icons.py")
+        for item, spec in game.ITEMS.items():
+            self.assertIn("glyph", spec, item)
+
+
 if __name__ == "__main__":
     unittest.main()