Swaps 6 JstPeriod.* callsites in mission code to IGameCalendarService.
Also drops the manual `jstNow = now.ToOffset(+9).AddHours(-2)` shift in
MissionAssembler — BP monthly missions now key off UTC calendar month, and
the start/end wire timestamps become UTC-midnight month boundaries. This
matches the plan's all-UTC discipline; wire fidelity for BP monthlies
is not shipped yet.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2b0cd516f0