feat(examples): add workout replay e2e

Wrap the workout page with the shared runtime, add export replay over command/event truth, and cover the running HTTP app with an end-to-end test that exercises runtime asset loading and product interactions.

req: examples/001

req: local/001

req: local/003

req: local/004

req: host/001

examples/workout/templates/workout.heml

@@ -21,6 +21,9 @@
   <section class="local-truth">
     <h2>Private event log</h2>
     <pre data-hemx-slot="event_log">{+ self.event_log +}</pre>
+    <h3>Replay export</h3>
+    <pre data-hemx-slot="export_payload">{+ self.export_payload +}</pre>
+    <button type="button" data-hemx-handle="replay_export">Replay exported log</button>
   </section>
 
   <section class="host">