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>

cmd/server/main.go

@@ -158,7 +158,7 @@ func run(cfg config.Config, logger *slog.Logger) error {
 		return err
 	}
 
-	planSvc, err := plan.NewService(db, weekDrafter(ai, guard), runner, googleSvc, notifier, sched.Wake, cfg.PublicURL, logger)
+	planSvc, err := plan.NewService(db, weekDrafter(ai, guard), runner, googleSvc, notifier, sched.Wake, cfg.PublicURL, sched.Now, logger)
 	if err != nil {
 		return err
 	}