test(browser): the exit code a dead run and a violated one actually leave

Drives the built binary against a page with nothing to tap and reads the
process status, then the same run through campaign to pin what lands in
runs.jsonl: exit_code 1 there is a detection the analysis drops as missing
data.

test/browser/testdata/nothing-to-tap/index.html

@@ -0,0 +1,10 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>nothing-to-tap</title>
+  </head>
+  <body>
+    <p id="banner">nothing here answers a tap</p>
+  </body>
+</html>