test(i18n): calibrate the census width guards to the measured population (objectui#12145)

The source-count floors were guesses above the real shipped population;
they are now floors under it, plus a guard that the files directly under a
src/ root, which the card's pathspec never read, are in the population.

Claude-Session: https://claude.ai/code/session_016djJF12Qt14ejKR5Vjt4sK
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/i18n/src/__tests__/ariaLabelLiteralCensus-12145.test.ts

@@ -315,9 +315,11 @@ describe('no shipped source names an element with a literal aria-label unless it
     for (const pkg of ['apps/console', 'packages/components', 'packages/plugin-designer', 'packages/auth']) {
       expect(population, `${pkg} is scanned`).toContain(pkg);
     }
-    expect(sources.length).toBeGreaterThan(3000);
-    const tsx = sources.filter((s) => s.rel.endsWith('.tsx'));
-    expect(tsx.length).toBeGreaterThan(1500);
+    expect(sources.length).toBeGreaterThan(1000);
+    expect(sources.filter((s) => s.rel.endsWith('.tsx')).length).toBeGreaterThan(500);
+    // The card's pathspec read none of these: a file directly under a `src/`.
+    const directlyUnderSrc = sources.filter((s) => /^(packages|apps)\/[^/]+\/src\/[^/]+$/.test(s.rel));
+    expect(directlyUnderSrc.length, 'files directly under a src/ root are in the population').toBeGreaterThan(100);
   });
 
   /**