The 'filters content by date range' test used fixed fixture dates
(### 2026-02-25) inside a 30-day window, so it passed only while the
real clock was within 30 days of that date and began failing as the
current date advanced. extractContentByDateRange is correct; it uses
new Date() as "now". Pin the system clock with vi.setSystemTime so the
fixed fixture dates evaluate deterministically regardless of the wall
clock.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
