Add the Marble and Highlighter templates, completing the 13 reference templates

Marble uses a flat-to-gradient band in place of the marble photo and bundles Lustria (OFL).
Both logo slots are opt-in. Quirk 13 documents a fontkit glyph-cache issue that the
tests work around with warm-up renders; the engine fix follows separately.

public/fonts/manifest.json

@@ -281,6 +281,29 @@
         }
       ]
     },
+    {
+      "family": "Lustria",
+      "folder": "lustria",
+      "license": "OFL-1.1",
+      "licenseFile": "OFL.txt",
+      "fonts": [
+        {
+          "file": "Lustria-Regular.ttf",
+          "weight": 400,
+          "style": "normal",
+          "sha256": "8b50753779d151674dcc74bdf9cdde1e788d8fb2b9ace8fb183a0def0f7361ce",
+          "fsType": 0,
+          "upm": 1000,
+          "ascent": 955,
+          "descent": -327,
+          "lineGap": 0,
+          "capHeight": 704,
+          "xHeight": 504,
+          "hasRupee": false,
+          "hasTabularNums": false
+        }
+      ]
+    },
     {
       "family": "Montserrat",
       "folder": "montserrat",