The trial-expiry-upgrade e2e spec drives the real
chrome-extension://<id>/popup.html and
options.html#senders / #upgrade surfaces, so
no html host page is actually required for the in-page assertions.
This file is shipped because the per-spec allowed_paths inventory in
.lead/tasks/phase1-w4-t3.json lists it, and keeping the
fixture as a documented placeholder avoids a follow-up "create empty
file" task. The spec seeds an expired-trial
chrome.storage.local.'mailshade.license'
payload (trialEndsAt = now - 1 day, no
licenseKey) before opening the popup; see
docs/e2e-trial-expiry-upgrade.md for the harness contract.