{
  "registry": "protocol_header",
  "version": "1.0",
  "description": "Canonical registry for protocol header loci, alleles, codes, and deprecations.",

  "loci": [
    {
      "id": "RTT",
      "code": "L1",
      "name": "Immediate Regime / Atomic Cycle",
      "invariant": "Immediate cycle; atomic update; no intermediaries.",
      "alleles": [
        { "code": "L1-A1", "value": "rtt=1",          "status": "current" },
        { "code": "L1-A2", "value": "rtt=unit",       "status": "current" },
        { "code": "L1-A3", "value": "rtt=single-hop", "status": "current" },
        { "code": "L1-A4", "value": "rtt=atomic",     "status": "current" },
        { "code": "L1-A5", "value": "cycle=atomic",   "status": "current" }
      ]
    },

    {
      "id": "COHERENCE",
      "code": "L2",
      "name": "Explicit Alignment",
      "invariant": "Alignment explicitly declared; not inferred.",
      "alleles": [
        { "code": "L2-A1", "value": "coherence=declared", "status": "current" },
        { "code": "L2-A2", "value": "coherence=explicit",  "status": "current" },
        { "code": "L2-A3", "value": "coherence=stated",    "status": "current" }
      ]
    },

    {
      "id": "DRIFT",
      "code": "L3",
      "name": "Bounded Deviation",
      "invariant": "Deviation allowed but strictly bounded.",
      "alleles": [
        { "code": "L3-A1", "value": "drift=bounded",     "status": "current" },
        { "code": "L3-A2", "value": "drift=constrained", "status": "current" },
        { "code": "L3-A3", "value": "drift=clamped",     "status": "current" }
      ]
    },

    {
      "id": "PARADOX",
      "code": "L4",
      "name": "Structural Contradiction",
      "invariant": "Contradiction is structural, encoded, architected.",
      "alleles": [
        { "code": "L4-A1", "value": "paradox=structural",   "status": "current" },
        { "code": "L4-A2", "value": "paradox=encoded",      "status": "current" },
        { "code": "L4-A3", "value": "paradox=architected",  "status": "current" }
      ]
    }
  ],

  "matrix": {
    "english_combinations": 135,
    "languages": 12,
    "total_combinations": 1620,
    "generator": "HEADER(L,i,j,k,m) = RTT_L[i] | COH_L[j] | DRIFT_L[k] | PAR_L[m]"
  },

  "deprecations": [
    {
      "value": "ttl=1",
      "reason": "TTL semantics incompatible with RTT invariant.",
      "status": "deprecated"
    },
    {
      "value": "jitter=controlled",
      "reason": "Network-specific; violates drift invariant.",
      "status": "deprecated"
    },
    {
      "value": "mode=non-fatal",
      "reason": "Error-state semantics incompatible with paradox invariant.",
      "status": "deprecated"
    }
  ]
}