Read the plan service's today from the scheduler's clock

The plan service read "today" from time.Now, so the plan-draft schedule
tests could not pin the plan_ready title on the fake clock. NewService now
takes a clock; the server passes the scheduler's Now. The plan-draft tests
read the started scheduler's fake clock and assert each plan_ready row's
title and channel alongside the existing key assertions.

Maestro task ece60217-04d0-43a4-9690-4aba2a00d420

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/plan/draft.go

@@ -96,7 +96,7 @@ func (s *Service) revision(ctx context.Context, weekStart store.LocalDate) (int6
 // the household context, the pool, last week's dinners and the dinner
 // time.
 func (s *Service) request(ctx context.Context, weekStart store.LocalDate) (skills.WeekRequest, error) {
-	hctx, err := harness.BuildContext(ctx, s.st, time.Now(), ContextBudget)
+	hctx, err := harness.BuildContext(ctx, s.st, s.now(), ContextBudget)
 	if err != nil {
 		return skills.WeekRequest{}, fmt.Errorf("plan: %w", err)
 	}