services/events.py::list_events treated any event with end_dt IS NULL
as perpetually matching, so a point-event created last week would be
returned as "happening today" whenever the briefing or list_events
tool queried today's window. That manifested as briefings claiming
past events were scheduled for the current day.
Split the null-end branch: point events now only match when start_dt
falls within [date_from, date_to]. Events with an end_dt continue to
use standard overlap logic.
This bug affected both the legacy briefing synthesis and the agentic
list_events tool path, since both call the same events service.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Bryan Van Deusen
22a13636e8