feat: openui report library

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/report-ui.test.ts

@@ -0,0 +1,11 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+const { library, reportPromptOptions } = await import("../lib/report-ui.ts");
+
+test("the prompt advertises every component and the root", () => {
+  const p = library.prompt(reportPromptOptions);
+  for (const n of ["Report", "Headline", "VerdictBlock", "MetricGrid", "Findings", "OptionTable",
+                   "StepList", "SqlBlock", "ScoreBar", "Callout"]) assert.ok(p.includes(n), `missing ${n}`);
+  assert.match(p, /root/i);
+  assert.match(p, /never invent/i);
+});