GET /api/protocol/sybil

Returns the framework's current sybil-resistance posture — node fan-out, suspicious clusters, energy-per-attestation ratio.

Response — 200

{
  "ok": true,
  "fan_out_p95": 7,
  "suspicious_clusters": 0,
  "energy_per_attestation_j": 2.87e-21,
  "expected_energy_per_attestation_j": 2.87e-21,
  "posture": "healthy"
}

posture ∈ healthy, degraded, under_attack.