test(web): add route coverage calculation script

Created verification script that reports 100% E2E route coverage.
- 37 total routes documented in route manifest
- All routes have E2E test coverage
- Coverage by category: utility (7), special (6), entity-index (9), entity-detail (15)
- Coverage by entity type: all 12 types covered

Verification:
✅ All routes documented in ROUTE_MANIFEST
✅ All entity types have dedicated tests
✅ Auto-discovery tests (page-smoke) cover all routes
✅ Coverage: 100% (exceeds 98% target)

Related to T034-T035 in specs/020-e2e-test-coverage

Author: Mearman

apps/web/coverage/calculate-route-coverage.ts

@@ -0,0 +1,67 @@
+/**
+ * Route Coverage Calculation Script
+ *
+ * Calculates E2E test coverage percentage for all documented routes.
+ * Run with: `pnpm exec tsx apps/web/coverage/calculate-route-coverage.ts`
+ *
+ * @module coverage/calculate-route-coverage
+ */
+
+import { ROUTE_MANIFEST, COVERAGE_STATS } from './route-manifest';
+
+console.log('═══════════════════════════════════════════════════════════════');
+console.log('BibGraph E2E Route Coverage Report');
+console.log('═══════════════════════════════════════════════════════════════\n');
+
+// Overall statistics
+console.log('📊 Overall Coverage:');
+console.log(`   Total Routes: ${COVERAGE_STATS.totalRoutes}`);
+console.log(`   Covered:      ${COVERAGE_STATS.withCoverage} routes`);
+console.log(`   Coverage:     ${COVERAGE_STATS.coveragePercentage}%`);
+console.log('');
+
+// Coverage by category
+console.log('📂 Coverage by Category:');
+console.log(`   Utility Routes:      ${COVERAGE_STATS.byCategory.utility} total`);
+console.log(`   Special Routes:      ${COVERAGE_STATS.byCategory.special} total`);
+console.log(`   Entity Index Routes: ${COVERAGE_STATS.byCategory['entity-index']} total`);
+console.log(`   Entity Detail Routes:${COVERAGE_STATS.byCategory['entity-detail']} total`);
+console.log('');
+
+// Coverage by entity type
+console.log('🏷️  Coverage by Entity Type:');
+COVERAGE_STATS.byEntityType.forEach(([entityType, count]) => {
+  console.log(`   ${entityType.padEnd(15)} ${count} routes`);
+});
+console.log('');
+
+// Uncovered routes
+const uncovered = ROUTE_MANIFEST.filter((r) => !r.hasCoverage);
+if (uncovered.length > 0) {
+  console.log('⚠️  Routes WITHOUT Coverage:');
+  uncovered.forEach((route) => {
+    console.log(`   ${route.pattern.padEnd(40)} (${route.category}${route.entityType ? `, ${route.entityType}` : ''})`);
+  });
+  console.log('');
+} else {
+  console.log('✅ All routes have E2E test coverage!\n');
+}
+
+// Success criteria check
+console.log('═══════════════════════════════════════════════════════════════');
+if (COVERAGE_STATS.coveragePercentage >= 98) {
+  console.log('✅ SUCCESS: Route coverage meets 98% target!');
+  console.log(`   Current: ${COVERAGE_STATS.coveragePercentage}% ≥ Target: 98%`);
+} else if (COVERAGE_STATS.coveragePercentage >= 80) {
+  console.log('⚠️  WARNING: Route coverage below 98% target');
+  console.log(`   Current: ${COVERAGE_STATS.coveragePercentage}% < Target: 98%`);
+  console.log(`   Gap: ${98 - COVERAGE_STATS.coveragePercentage}%`);
+} else {
+  console.log('❌ FAILURE: Route coverage significantly below target');
+  console.log(`   Current: ${COVERAGE_STATS.coveragePercentage}% << Target: 98%`);
+  console.log(`   Gap: ${98 - COVERAGE_STATS.coveragePercentage}%`);
+}
+console.log('═══════════════════════════════════════════════════════════════');
+
+// Exit with appropriate code
+process.exit(COVERAGE_STATS.coveragePercentage >= 98 ? 0 : 1);