feat(scheduler-sim-discrete-clock): remove the simulator speed argument and shadow copy (task 3.1)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/scheduler/testsuite/test_repl_limit_table.c

@@ -2759,7 +2759,6 @@ static void det_run_scripted_repl_session(const char* fixture_path,
     memset(&args, 0, sizeof(args));
     args.replay_path  = (char*)fixture_path;
     args.sim_start_ts = SCHED_SIM_START_TS_LATEST;
-    args.sim_speed    = 0;
     args.output_path  = out_path;
     args.interactive  = true;