22541 extract breadcrumb route-map helpers and add precedence guard tests

tests/phase22/breadcrumbs-route-map-structure.test.cjs

@@ -60,17 +60,25 @@ test("breadcrumbs/merged resolver renders mapped routes through single helper in
     const source = loadBreadcrumbSource();
 
     assert.strictEqual(
-        source.includes("const mappedRouteRendererMaps = ["),
+        source.includes('from "../lib/routing/breadcrumbRouteMaps"'),
         true,
-        "Expected grouped mapped route renderer map composition to exist"
+        "Expected breadcrumbs to import shared breadcrumb route-map helper module"
     );
 
     assert.strictEqual(
         source.includes(
-            "const getMappedRendererByPath = (path, routeRendererMap) =>"
+            "const mappedRouteRendererMaps = buildBreadcrumbRendererMaps({"
         ),
         true,
-        "Expected shared mapped renderer lookup helper to exist"
+        "Expected grouped mapped route renderer map composition to use helper builder"
+    );
+
+    assert.strictEqual(
+        source.includes(
+            "return resolveMappedRouteRendererByMaps(path, mappedRouteRendererMaps);"
+        ),
+        true,
+        "Expected resolver to delegate to shared route-map resolver helper"
     );
 
     assert.strictEqual(
@@ -104,6 +112,32 @@ test("breadcrumbs/merged resolver renders mapped routes through single helper in
         false,
         "Expected /myportal/addresssearchresults explicit branch to be removed after mapping"
     );
+
+    const mapBuilderCallIndex = source.indexOf(
+        "const mappedRouteRendererMaps = buildBreadcrumbRendererMaps({"
+    );
+    const mapBuilderSlice = source.slice(
+        mapBuilderCallIndex,
+        mapBuilderCallIndex + 300
+    );
+
+    const simpleRouteOrderIndex = mapBuilderSlice.indexOf(
+        "simpleRouteRenderersByPath"
+    );
+    const simpleLinkTextPairOrderIndex = mapBuilderSlice.indexOf(
+        "simpleLinkTextPairRenderersByPath"
+    );
+    const simpleMyPortalOrderIndex = mapBuilderSlice.indexOf(
+        "simpleMyPortalRouteRenderersByPath"
+    );
+
+    assert.strictEqual(
+        simpleRouteOrderIndex >= 0 &&
+            simpleLinkTextPairOrderIndex > simpleRouteOrderIndex &&
+            simpleMyPortalOrderIndex > simpleLinkTextPairOrderIndex,
+        true,
+        "Expected map builder call to preserve explicit route-map ordering (simple -> link-text -> myportal)"
+    );
 });
 
 test("breadcrumbs/dynamic callback branch remains explicit for myportal case incident route", async () => {