Add the Monolith and Cobalt Stripe templates

Standalone layouts for Canva templates 3 and 8, with the user's logo sized to the
placeholder box, a CapRule decor primitive, optional TableRows rule/heading options,
and a separate 1..45-row sweep test file.

src/pdf/templates/harness.sweep.standalone.test.tsx

@@ -0,0 +1,10 @@
+import { expect, it } from "vitest";
+import { describeSweep, STANDALONE_SWEEP } from "./harness.sweep";
+import { TEMPLATES } from "./registry";
+
+// Monolith and Cobalt Stripe: the same sweep as the other templates, in a second file so the two run side by side.
+describeSweep((id) => STANDALONE_SWEEP.includes(id));
+
+it("the standalone sweep names registered templates only", () => {
+  expect(STANDALONE_SWEEP.every((id) => Object.hasOwn(TEMPLATES, id))).toBe(true);
+});