test(playground): require the demo project description to match its reports

New gate tests/kb-update/test-demo-project-description.test.mjs. The demo project card must name the domain of the classify fixture's system description (bostøtte), must not name byggesak, and the inlined description must match scripts/build-demo-state.mjs. Red on 70731af: 1 of 3 fails.

Chose a pinned domain term shared with the classify fixture over a generic word-overlap score, because the old description already shared generic words (kommune, chatbot, innbyggere) with the reports and would have passed.

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

tests/kb-update/test-demo-project-description.test.mjs

@@ -0,0 +1,72 @@
+// tests/kb-update/test-demo-project-description.test.mjs
+// Preventive gate: the demo project card describes the same system as the 17
+// demo reports it carries.
+//
+// The demo project (`scripts/build-demo-state.mjs`, inlined into the playground
+// HTML as `<script id="demo-state-v1">`) is shown on the project card and in the
+// screenshots. The reports come from `playground/test-fixtures/*.md`. The
+// classify fixture's `Beskrivelse:` line is the canonical system description:
+// a citizen chatbot that pre-assesses applications for housing allowance
+// (bostøtte). The gate fails when the project description does not name that
+// domain, or names the building-permit domain (byggesak) the reports never
+// mention.
+//
+// Chose a pinned domain term shared with the classify fixture over a generic
+// word-overlap score, because the old description already shared generic words
+// (kommune, chatbot, innbyggere) with the reports and would have passed.
+
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+
+const pluginRoot = fileURLToPath(new URL('../../', import.meta.url));
+const PLAYGROUND_HTML = 'playground/ms-ai-architect-playground.html';
+const BUILD_SCRIPT = 'scripts/build-demo-state.mjs';
+const CLASSIFY_FIXTURE = 'playground/test-fixtures/classify.md';
+const DOMAIN_TERM = 'bostøtte';
+const FOREIGN_TERM = 'byggesak';
+
+function demoProject() {
+  const html = readFileSync(pluginRoot + PLAYGROUND_HTML, 'utf8');
+  const m = html.match(/<script type="application\/json" id="demo-state-v1">([\s\S]*?)<\/script>/);
+  assert.ok(m, `demo-state-v1 block not found in ${PLAYGROUND_HTML}`);
+  const state = JSON.parse(m[1]);
+  const project = state.projects.find((p) => p.id === state.activeProjectId);
+  assert.ok(project, `active demo project ${state.activeProjectId} not found`);
+  return project;
+}
+
+function classifySystemDescription() {
+  const md = readFileSync(pluginRoot + CLASSIFY_FIXTURE, 'utf8');
+  const line = md.split('\n').find((l) => /^\s*(\*\*)?Beskrivelse:/.test(l));
+  assert.ok(line, `no "Beskrivelse:" line in ${CLASSIFY_FIXTURE}`);
+  return line;
+}
+
+test('the classify fixture describes the system with the pinned domain term', () => {
+  assert.match(classifySystemDescription().toLowerCase(), new RegExp(DOMAIN_TERM));
+});
+
+test('the demo project description names the domain its reports are about', () => {
+  const { description } = demoProject();
+  assert.match(
+    description.toLowerCase(),
+    new RegExp(DOMAIN_TERM),
+    `demo project description does not mention "${DOMAIN_TERM}": ${description}`,
+  );
+  assert.doesNotMatch(
+    description.toLowerCase(),
+    new RegExp(FOREIGN_TERM),
+    `demo project description mentions "${FOREIGN_TERM}", which no report is about: ${description}`,
+  );
+});
+
+test('the inlined demo project description matches the build script', () => {
+  const { description } = demoProject();
+  const source = readFileSync(pluginRoot + BUILD_SCRIPT, 'utf8');
+  assert.ok(
+    source.includes(description),
+    `${BUILD_SCRIPT} does not contain the inlined description; rerun node ${BUILD_SCRIPT}`,
+  );
+});