{
  "tests": 8,
  "passed": true,
  "failures": 0,
  "errors": 0,
  "checks": [
    "test_baseline_preserves_source_samples",
    "test_common_loudness_and_headroom",
    "test_equal_frames_and_finite_unclipped_audio",
    "test_mono_and_tail",
    "test_no_lead_reordering_or_offset",
    "test_sources_unchanged",
    "test_stems_reconstruct_final_mix",
    "test_variants_are_distinct"
  ],
  "limits": "Technical invariants only; no human or perceptual-model listening approval."
}