test(yardstick): a new-work order without a slug leaves the use numerator not measured (red)

Measured 2026-10-03: the two new-work orders on the real queue carry no `slug:`
(0 of 690 orders do), so "0 of 2" was forced by the missing join key, not by
work going around Voyage. An absence without a possible match is "not
measured", never 0.

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

tests/scripts/yardstick.test.mjs

@@ -228,6 +228,24 @@ test('use: plan and prove are NEW work, ikke-nytt is not; unmarked and pre-2026-
   } finally { cleanup(coord); }
 });
 
+test('use: a new-work order without a slug leaves the numerator NOT MEASURED - never a 0', () => {
+  // Measured 2026-10-03 on the real queue: 2 new-work orders, 0 of 690 orders carry `slug:`.
+  // "0 of 2" would read as two deliveries outside Voyage, when nothing could match at all.
+  const coord = fixture({
+    'r/orders/a.md': order({ id: 'a', date: '2026-09-29T00:00:00Z', marker: 'prove', slug: 'feat-a' }),
+    'r/orders/b.md': order({ id: 'b', date: '2026-09-29T00:00:00Z', marker: 'plan' }),
+  });
+  try {
+    const row = measureUse({ queue: readOrders(coord), slugs: new Set(['feat-a']), cutoff: DEFAULT_CUTOFF });
+    assert.equal(row.countable, false);
+    assert.equal(row.value, null);
+    assert.equal(row.denominator, 2, 'the denominator is still read and shown');
+    assert.equal(row.facts.withVoyageRun, 1, 'what CAN be matched is still reported');
+    assert.equal(row.facts.withoutSlug, 1);
+    assert.match(row.detail, /1 of 2 new-work orders carry no slug - the numerator is not measured/);
+  } finally { cleanup(coord); }
+});
+
 test('use: work-class in the frontmatter no longer decides anything - only the marker does', () => {
   const coord = fixture({
     'r/orders/a.md': order({ id: 'a', date: '2026-09-29T00:00:00Z', workClass: 'new', slug: 'feat-a' }),