{
  "schema_version": 1,
  "status": "verified",
  "stage": 1,
  "id": "small_snn",
  "scientific_scope": "software reference network only; not biological validation or scaling evidence",
  "protocol": {
    "neurons": 3,
    "synapses": 2,
    "topology": "feed-forward chain A -> B -> C",
    "dt_ms": 1.0,
    "model": "izhikevich-2003",
    "secondary_mechanisms": false,
    "reference_synaptic_bounds": {
      "w_min": 0.0,
      "w_max": 100.0,
      "scope": "verification fixture only; production defaults unchanged"
    },
    "connections": [
      {"source": "A", "target": "B", "weight": 100.0, "delay_ticks": 1},
      {"source": "B", "target": "C", "weight": 100.0, "delay_ticks": 2}
    ],
    "initial_trigger": "A.v = 30 mV at tick 0"
  },
  "expected_causal_trace": [
    {"tick": 0, "spikes": ["A"], "delivered_events": 0, "queued_events": 1},
    {"tick": 1, "spikes": ["B"], "delivered_events": 1, "queued_events": 1},
    {"tick": 2, "spikes": [], "delivered_events": 0, "queued_events": 1},
    {"tick": 3, "spikes": ["C"], "delivered_events": 1, "queued_events": 0}
  ],
  "proofs_required": [
    "explicit_sparse_topology",
    "delayed_event_delivery",
    "causal_spike_propagation",
    "deterministic_replay",
    "batch_tick_equivalence"
  ],
  "proofs": {
    "explicit_sparse_topology": true,
    "delayed_event_delivery": true,
    "causal_spike_propagation": true,
    "deterministic_replay": true,
    "batch_tick_equivalence": true
  },
  "verification_scope": "Stage-1 software contract; not evidence of biological equivalence, cognition, learning quality or large-scale tractability"
}