docs: [verified] move metric contracts under Measurement

scripts/sidebar-coverage.mjs

@@ -82,6 +82,11 @@ export async function verifySidebarCoverage() {
     else if (file === 'strategy/index.html') {
       assert(readFileSync(join('build',file),'utf8').includes('http-equiv="refresh"'), 'Strategy alias must remain a redirect');
       reason = 'Legacy Strategy redirect alias to Target';
+    } else if (file === 'strategy/reference/measurement-contracts/index.html') {
+      const body = readFileSync(join('build',file),'utf8');
+      assert(body.includes('window.location.replace') && body.includes('name="robots" content="noindex"') && !body.includes('<article'), 'Metric alias must remain a non-indexed redirect');
+      assert.equal(body, readFileSync(join('static',file),'utf8'));
+      reason = 'Legacy measurement-contracts hash-aware redirect to canonical Measurement pages';
     } else if (file.startsWith('diagrams/') && readFileSync(join('build',file),'utf8').includes('<svg')) {
       assert.equal(readFileSync(join('build',file),'utf8'), readFileSync(join('static',file),'utf8'), `Viewer must match generated static asset: ${file}`);
       reason = 'Standalone diagram viewer asset, not documentation';