test(chrome): compare both selector matchers over one live page

Selector matching is written once per runtime: internal/hierarchy over the
dump, web-runtime.ts over the DOM. Nothing made the two agree, and a
selector that resolves on one and not the other is silent, since an empty
match yields no action and the run still passes.

internal/driver/chrome/testdata/selector-parity.html

@@ -0,0 +1,15 @@
+<!doctype html>
+<html id="page" lang="en">
+  <head id="page-head">
+    <meta id="page-charset" charset="utf-8" />
+    <title id="page-title">selector parity</title>
+  </head>
+  <body id="page-body">
+    <div id="summary_card" aria-label="summary_card, 3 customers">summary</div>
+    <div id="customer_list" aria-label="customer_list">
+      <div id="customer_row_a1" aria-label="customer_row_a1, Alice">Alice</div>
+      <div id="customer_row_b2" aria-label="customer_row_b2, Bob">Bob</div>
+      <div id="supplier_row_c3" aria-label="supplier_row_c3, Carol">Carol</div>
+    </div>
+  </body>
+</html>