feat(iace): norm cross-ref batches 2-5 (200 more → 500/671 covered)

- Batch 2: C-norms (woodworking, food, conveyors, lifts, agri, packaging)
- Batch 3: machining, escalators, piping, boilers, wind/PV, refrigeration
- Batch 4: paper sub-parts, playground (ASTM F1487), aircraft ground support, scaffolds, wire ropes, crane design EN 13001
- Batch 5: glass (EN 13035), ladders (ANSI A14), pools (APSP), explosives (DOT 49 CFR), amusement rides (ASTM F2291), drilling/foundation, eye protection (ANSI Z87.1), fire-fighting vehicles (NFPA 1901)

500 of 671 norms now have international identifier mappings. 171 remaining
will be covered in batches 6-7 (alphabetically: EN-1870-x remainder onward
plus ISO-x specials).

Tests: TestCrossRef_BatchCoverage expects 500. All 8 cross-ref tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ai-compliance-sdk/internal/iace/norm_crossref_test.go

@@ -4,10 +4,35 @@ import (
 	"testing"
 )
 
-func TestCrossRef_Batch1_Coverage(t *testing.T) {
+// expectedCrossRefCount must be updated as batches are added.
+// Batches 1-5 × 100 = 500.
+const expectedCrossRefCount = 500
+
+func TestCrossRef_BatchCoverage(t *testing.T) {
 	all := ListNormCrossRefs()
-	if len(all) != 100 {
-		t.Fatalf("expected 100 cross-ref entries from batch 1, got %d", len(all))
+	if len(all) != expectedCrossRefCount {
+		t.Fatalf("expected %d cross-ref entries, got %d", expectedCrossRefCount, len(all))
+	}
+}
+
+func TestCrossRef_EN8120_HasASME(t *testing.T) {
+	cr := GetNormCrossRef("EN-81-20")
+	hasASME := false
+	for _, m := range cr.Mappings {
+		if m.Region == "US-ASME" {
+			hasASME = true
+			break
+		}
+	}
+	if !hasASME {
+		t.Error("EN-81-20 (lifts) should map to ASME A17.1 in US-ASME region")
+	}
+}
+
+func TestCrossRef_EN13445_HasMultipleRegions(t *testing.T) {
+	cr := GetNormCrossRef("EN-13445-1")
+	if len(cr.Mappings) < 4 {
+		t.Errorf("EN-13445-1 (pressure vessels) should have 4+ regional mappings, got %d", len(cr.Mappings))
 	}
 }