Crossing is geometry.
Tension is a vector.

DiagonalAxisRoleAssignment {
  assignmentRef,
  scopeRef,
  snapshotRef,
  mainAxisRef,
  counterAxisRef,
  assignmentOwnerRef,
  sourceRef,
  provenance,
  status,
  mutationAllowed: false
}

DiagonalTensionProfileSetPolicy {
  selectionMode: "EXPLICIT_ROLE_ASSIGNMENTS_ONLY",
  channelSelectionMode: "EXPLICIT_REQUESTED_CHANNELS_ONLY",
  maxProfiles: 128,
  maxChannelsPerProfile: 64,
  overflowMode: "N_A_WITHOUT_TRUNCATION",
  duplicateRolePairMode: "N_A_NO_WINNER",
  autoRoleSelection: false,
  autoTensionInference: false,
  autoScoring: false,
  autoCandidateGeneration: false
}

TensionProfileAttachment {
  diagonalCompositionSeedRef,
  tensionProfileSetRef,
  status,
  mutationAllowed: false
}

{
  "module": "Compo 24.03",
  "name": "counter_diagonal_and_tension_profiles",
  "version": "1.0-canonical",
  "canonical_main_title": "Counter-diagonal and tension profiles",
  "topic": "24_ДИАГОНАЛЬНАЯ_КОМПОЗИЦИЯ",
  "scope": "EXPLICIT_MAIN_COUNTER_AXIS_ROLE_ASSIGNMENT_EXACT_PAIR_GEOMETRY_INTERSECTION_ACUTE_CROSSING_ANGLE_AND_OWNER_QUALIFIED_VECTOR_TENSION_PROFILE_DESCRIPTORS_ONLY_WITHOUT_TARGET_FIT_SCORING_OR_CANDIDATE_GENERATION",
  "main_topic_contract": {
    "topic_title": "Диагональная композиция",
    "topic_goal": "Описывает диагональную структуру всей сцены: main diagonal, counter-diagonal, проекции масс на ось и controlled diagonal tension.",
    "expected_output": "DiagonalCompositionDescriptor, main/counter axes, projection distribution",
    "planned_files": [
      "24.00 Diagonal axis candidates",
      "24.01 Object orientation vs diagonal",
      "24.02 Mass distribution along diagonal",
      "24.03 Counter-diagonal and tension profiles",
      "24.04 Scoring, candidates and tests"
    ]
  },
  "ownership": {
    "owner": "Compo24.03",
    "owns": [
      "DiagonalAxisRoleAssignment",
      "CounterDiagonalRelationClass taxonomy",
      "CounterDiagonalRelationDescriptor",
      "DiagonalTensionChannelEvidence adapter",
      "DiagonalTensionChannelResolution",
      "DiagonalTensionProfileRequest",
      "DiagonalTensionProfile",
      "DiagonalTensionProfileSetPolicy",
      "DiagonalTensionProfileSet",
      "TensionProfileAttachment",
      "explicit main/counter role declaration over exact 24.00 axis candidates",
      "exact main/counter line-pair intersection and acute crossing-angle descriptors",
      "owner-qualified normalized tension-channel vector resolution without scalar aggregation",
      "identity/status/provenance rules for Topic24 counter-diagonal/tension layer",
      "non-mutating correction request for role assignment / tension-channel evidence errors"
    ],
    "does_not_own": [
      "24.00 axis candidate identity or discovery — Compo24.00",
      "24.01 object-orientation relation — Compo24.01",
      "24.02 mass projection/distribution — Compo24.02",
      "automatic main/counter selection from angle, mass, hierarchy or appearance — prohibited here",
      "automatic tension inference from orientation or mass — prohibited here",
      "target tension desirability, MetricResult, final scoring or candidate generation — Compo24.04",
      "flow-template diagonal path matching — Topic25",
      "hierarchy / dominance / beautyScore / final-layout ranking",
      "foreign geometry/style/semantic mutation"
    ]
  },
  "consumes": [
    "exact 24.00 DiagonalAxisCandidateSet and DiagonalCompositionSeed lineage",
    "explicit mainAxisRef + counterAxisRef role assignment",
    "optional owner-qualified normalized tension-channel evidence",
    "optional foreign refs from 24.01/24.02 only as declared evidence lineage, never auto-interpreted"
  ],
  "provides": [
    "DiagonalAxisRoleAssignment",
    "CounterDiagonalRelationDescriptor",
    "DiagonalTensionChannelResolution[]",
    "DiagonalTensionProfile[]",
    "DiagonalTensionProfileSet",
    "TensionProfileAttachment"
  ],
  "owns_metrics": [],
  "independent_numeric_votes": 0,
  "geometry_math": {
    "unitDirection": "u=d/||d||",
    "lineRelation": "cross(d_main,d_counter)==0 ? PARALLEL_DISTINCT : INTERSECTING",
    "intersection": "p_main + t*d_main where t=cross(p_counter-p_main,d_counter)/cross(d_main,d_counter)",
    "acuteCrossingAngle": "acos(abs(dot(u_main,u_counter))) in [0,pi/2]",
    "normalizedAngularSeparation": "acuteCrossingAngle/(pi/2)",
    "zeroAngle": "valid for distinct parallel lines",
    "ninetyDegrees": "valid geometry, not automatically optimal"
  },
  "tension_profile_semantics": {
    "profile": "VECTOR_ONLY",
    "builtInGeometricChannels": [
      "acuteCrossingAngleRadians",
      "normalizedAngularSeparation"
    ],
    "ownerQualifiedChannels": "explicit values in [0,1] with exact channelRef and owner/source lineage",
    "scalarTension": null,
    "qualityScore": null,
    "targetFit": null,
    "implicitWeighting": false,
    "implicitEqualWeighting": false
  },
  "status_semantics": {
    "OK": "valid exact root lineage, explicit role assignment and resolved requested channels",
    "N_A": "missing axis, equivalent role conflict, missing/conflicting requested channel evidence or bounded-policy overflow; never numeric zero",
    "INVALID": "malformed/impossible record; never numeric zero"
  },
  "firewalls": [
    "main axis != more important object",
    "counter axis != weaker axis",
    "counter diagonal need not be perpendicular",
    "parallel distinct lines are valid geometry and have zero acute angle",
    "crossing angle != aesthetic quality",
    "normalizedAngularSeparation != score",
    "explicit channel value 0 is valid data",
    "tension profile != scalar tension score",
    "orientation alignment != tension unless an owner explicitly supplies a tension channel",
    "mass spread != tension unless an owner explicitly supplies a tension channel",
    "controlled tension is a downstream target-fit concept owned by 24.04",
    "N_A != 0",
    "INVALID != 0",
    "local != global"
  ],
  "visual_explanation": {
    "diagrams": [
      "main vs counter diagonal with exact crossing point",
      "counter diagonal need not be perpendicular",
      "parallel-distinct counter axis with no intersection",
      "acute crossing angle normalized from 0 to 1",
      "vector tension channels with no scalar aggregation",
      "24.00→24.03→24.04 ownership pipeline"
    ]
  },
  "topic24ProgressAfterThisModule": "4/5 local",
  "next_module": "Compo 24.04 — Scoring, candidates and tests",
  "hard_stop": "No 24.04 scoring/candidate generator implementation in this file"
}