isHostedSubscriptionValid was treating any tenant with a non-nil
TrialEndsAt as a valid bounded trial, never comparing the timestamp to
the current time. A tenant whose trial ended in the past but whose
stored subscription state was still "trial" (e.g. lease refresh failed
or never ran) retained full hosted Cloud access indefinitely.
The validity rule now requires both that a trial end timestamp exists
AND that time.Now() is before it. Refactored the switch to make the
trial branch read explicitly: nil evaluator -> deny, nil end -> deny,
past end -> deny, otherwise allow.
Added TestTenantMiddleware_HostedMode_ExpiredTrial_Blocked as the
regression test (mirrors the existing BoundedTrial_Allowed +
UnboundedTrial_Blocked pair with a past-dated trial end).
rcourtman
0f4c831fab