feat: simplify assurance reports with progressive disclosure

packages/casan-control-panel/backend/test/reports.test.ts

@@ -145,6 +145,8 @@ test('HTML export is standalone, escaped and contains no hard-coded maturity sco
   assert.doesNotMatch(html, /Average\s+\d|\/100|218 core tests/i);
   assert.match(html, /No maturity score or telemetry value is hard-coded/);
   assert.match(html, /Operational evidence, ready for a decision/);
+  assert.match(html, /Run distribution/);
+  assert.match(html, /<details class="technical">/);
   assert.match(html, /Evidence provenance/);
   assert.match(html, /@page\{size:A4/);
 });
@@ -192,6 +194,7 @@ test('per-run assurance export carries H1-H7 and truthful H6 availability', () =
   assert.match(html, /Live assurance rail · H1 → H7/);
   assert.match(html, /Evidence fields/);
   assert.match(html, /Decision and evidence detail/);
+  assert.match(html, /<details class="technical">/);
   assert.match(html, /@page\{size:A4/);
   assert.match(html, /Unavailable/);
   assert.doesNotMatch(html, /\$0(?:\.0+)?/);