{
  "schema_version": 1,
  "concept": "4I.5B",
  "title": "Single-bounce specular reflection reference post-change comparison",
  "artifact": "post-change-comparison",
  "post_change_commit": "working-tree",
  "boundary": {
    "model_id": "single_bounce_specular_reflection_reference_v1",
    "route": "POST /api/sub-thz-reflection-reference",
    "readiness": "reference_only",
    "canonical_propagation_modified": false,
    "canonical_network_rf_modified": false,
    "research_sub_thz_80db_rule_modified": false,
    "direct_reflected_multipath_sum_added": false,
    "production_candidate_allowed": false
  },
  "invariance_targets": [
    "canonical_2p6ghz",
    "canonical_28ghz",
    "research_sub_thz",
    "concept_4i2a_atmospheric_reference",
    "concept_4i2b_p1411_reference",
    "concept_4i3_measurement_validation",
    "concept_4i4_material_reference",
    "p526_diagnostic",
    "building_entry",
    "interference_radio_quality",
    "optimization"
  ],
  "evidence": {
    "new_route_isolated": true,
    "new_model_is_not_in_propagation_dispatch": true,
    "new_model_is_not_in_validation_model_list": true,
    "explicit_facade_and_height_required": true,
    "p2040_gamma_applied_once": true,
    "two_leg_fspl_composition": false,
    "direct_path_calculated": false,
    "atmosphere_composition": false,
    "p1411_composition": false,
    "p526_composition": false,
    "research_wall_composition": false,
    "diffuse_scattering_modelled": false,
    "backend_targeted_tests": "passed",
    "backend_all_tests": "passed",
    "controlled_benchmark": "208076 evaluations over 1s; 6743 ns/op; 3988 B/op; 53 allocs/op on Apple M4",
    "backend_vet": "passed",
    "backend_race": "passed",
    "core_lab_vet": "passed",
    "core_lab_race": "passed",
    "frontend_unit_tests": "33 files / 185 tests passed",
    "frontend_lint": "passed",
    "frontend_build": "passed",
    "frontend_e2e": "33 passed / 11 skipped across desktop, tablet, and mobile projects",
    "docs_validation": "28 HTML pages / 38 API paths valid",
    "version_check": "passed; version 0.7.0",
    "diff_check": "passed"
  },
  "required_invariance_proof": {
    "method": "re-run canonical/reference fixture suites and compare recorded identities, values, and coupling flags against the pre-change baseline",
    "baseline": "docs/concept-4i5b-pre-change-baseline.json",
    "status": "quality gates passed; canonical/reference invariance contract remains unchanged"
  },
  "readiness": {
    "classification": "reference_only",
    "promoted": false,
    "production_candidate": false,
    "required_future_gates": [
      "independent image-source and P.2040 equation review",
      "measured facade geometry, normal, height, roughness, aperture, and visibility evidence",
      "specular-path measurement campaigns with polarization and antenna-basis provenance",
      "finite-facet, edge-diffraction, diffuse/BRDF, and multipath policy review",
      "independent Ankara transferability review",
      "explicit canonical integration approval if ever proposed"
    ]
  }
}