Orientation is relative.
Alignment is descriptive.

ObjectOrientationEvidence {
  scopeRef, snapshotRef,
  subjectRef,
  coordinateFrameRef,
  orientationSemantics: UNDIRECTED_AXIS | DIRECTED_VECTOR,
  direction: {dx,dy},
  sourceRef, sourceOwnerRef,
  confidence, provenance,
  status,
  mutationAllowed: false
}

DiagonalObjectOrientationDescriptor {
  subjectRef,
  axisCandidateRef,
  axisRef,
  orientationSemantics,
  objectDirection,
  axisDirection,
  cross,
  dot,
  cosine,
  angleDeg,
  axisAngleDeviationDeg,
  relationClass,
  evidenceRefs[],
  massDistributionRef: null,
  tensionProfileRef: null,
  scoreRef: null,
  status,
  mutationAllowed: false
}

{
  "module": "Compo 24.01",
  "name": "object_orientation_vs_diagonal",
  "version": "1.0-canonical",
  "canonical_main_title": "Object orientation vs diagonal",
  "topic": "24_ДИАГОНАЛЬНАЯ_КОМПОЗИЦИЯ",
  "scope": "EXPLICIT_OBJECT_ORIENTATION_SEMANTICS_OWNER_QUALIFIED_DIRECTION_EVIDENCE_AND_EXACT_RELATION_TO_EXPLICIT_24_00_DIAGONAL_AXIS_CANDIDATES_ONLY_WITHOUT_MASS_DISTRIBUTION_COUNTER_DIAGONAL_TENSION_SCORING_OR_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": "Compo24.01",
    "owns": [
      "ObjectOrientationSemantics taxonomy",
      "ObjectOrientationEvidence",
      "ObjectOrientationEvidenceResolution",
      "DiagonalObjectOrientationRequest",
      "DiagonalObjectOrientationRelationClass taxonomy",
      "DiagonalObjectOrientationDescriptor",
      "DiagonalObjectOrientationSetPolicy",
      "DiagonalObjectOrientationSet",
      "ObjectOrientationAttachment",
      "exact directed/undirected orientation equivalence rules",
      "dot/cross/cosine/angular-deviation descriptors relative to exact 24.00 axis candidate",
      "explicit-only bounded object-orientation relation selection",
      "identity/status/provenance rules for Topic24 object-orientation layer",
      "non-mutating correction request for object orientation evidence/request errors"
    ],
    "does_not_own": [
      "24.00 axis candidate identity or geometry — Compo24.00",
      "automatic object principal-axis extraction from shape/pixels — upstream geometry owner",
      "automatic directedness inference from arrowheads/faces/text/motion/semantics — foreign owner",
      "main diagonal or counter-diagonal role selection — Compo24.03/24.04 as explicitly modeled",
      "mass projection/distribution along diagonal — Compo24.02",
      "controlled diagonal tension profile — Compo24.03",
      "target profile, MetricResult, candidate generator or final scoring — Compo24.04",
      "flow-template diagonal path matching — Topic25",
      "dominance / hierarchy / beautyScore / final-layout ranking",
      "foreign geometry/style/semantic mutation"
    ]
  },
  "consumes": [
    "exact 24.00 DiagonalAxisCandidateSet and DiagonalCompositionSeed lineage",
    "explicit DiagonalObjectOrientationRequest[]",
    "owner-qualified ObjectOrientationEvidence[]",
    "exact shared scope/snapshot/coordinate-frame identity"
  ],
  "provides": [
    "ObjectOrientationEvidenceResolution[]",
    "DiagonalObjectOrientationDescriptor[]",
    "DiagonalObjectOrientationSet",
    "ObjectOrientationAttachment"
  ],
  "owns_metrics": [],
  "independent_numeric_votes": 0,
  "orientation_semantics": {
    "UNDIRECTED_AXIS": "v and -v are equivalent; exact opposite collinear orientation is EXACT_ALIGNED",
    "DIRECTED_VECTOR": "direction sign matters; exact opposite collinear orientation is EXACT_COUNTER_ALIGNED"
  },
  "relation_classes": ["EXACT_ALIGNED","EXACT_COUNTER_ALIGNED","EXACT_PERPENDICULAR","OBLIQUE"],
  "math": {
    "cross": "axis.dx*object.dy - axis.dy*object.dx",
    "dot": "axis.dx*object.dx + axis.dy*object.dy",
    "directedAngleRangeDeg": [0,180],
    "undirectedAxisDeviationRangeDeg": [0,90],
    "tolerance": null,
    "nearAlignedClass": null
  },
  "status_semantics": {
    "OK": "valid exact explicit lineage and relation geometry",
    "N_A": "missing/conflicting evidence or bounded-policy overflow; never numeric zero",
    "INVALID": "malformed/impossible record; never numeric zero"
  },
  "policy": {
    "selectionMode": "EXPLICIT_RELATION_REQUESTS_ONLY",
    "maxRelations": [1,4096],
    "overflow": "N_A_WITHOUT_TRUNCATION",
    "duplicateExactRequest": "N_A_NO_WINNER",
    "autoObjectOrientationExtraction": false,
    "autoDirectednessInference": false,
    "autoCartesianObjectAxisPairing": false,
    "autoMainAxisSelection": false,
    "autoScoring": false
  },
  "attachment_contract": {
    "diagonalCompositionSeedRef": "exact 24.00 seed identity",
    "objectOrientationSetRef": "exact",
    "mutationAllowed": false
  },
  "firewalls": [
    "object orientation != mass distribution",
    "object orientation != movement direction unless explicitly DIRECTED_VECTOR",
    "aligned != main diagonal",
    "counter-aligned object != counter-diagonal axis",
    "perpendicular != stable or unstable",
    "oblique != error",
    "smaller angular deviation != automatically better",
    "angle descriptor != score",
    "N_A != 0",
    "INVALID != 0",
    "local != global"
  ],
  "visual_explanation": {
    "diagrams": [
      "undirected object axis vs diagonal",
      "directed aligned and counter-aligned vectors",
      "exact perpendicular firewall",
      "oblique angle descriptor without quality inference"
    ]
  },
  "topic24ProgressAfterThisModule": "2/5 local",
  "next_module": "Compo 24.02 — Mass distribution along diagonal",
  "hard_stop": "No 24.02–24.04 implementation in this file"
}