43c790d0

By: Michael Lynch <git@mtlynch.io>

Replace package-level fixedNow and testNow with local test variables

Define `now` locally in each test function and pass it as a closure,
matching the pattern on master. This follows the AGENTS.md guideline to
define variables as close as possible to where they're first used.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>