SYNTHETIC REFERENCE — Build a small news brief that stays current
Not an independently observed product run.

1 new event: library opening on September 8, supported by S1. S2 grouped as duplicate coverage.
S3 excluded from new events because the announcement occurred in July.
The brief has one item, not three padded entries.

FAILURE CASE
All sources fail to load. Pass: state the check failed. Fail: recycle yesterday’s brief as today’s news.