Add interval homogeneity regression fixture suite

corpus/fixtures/interval_homogeneity_regression/EDO_24_microtonal_regular.json

@@ -0,0 +1,45 @@
+{
+  "schema_version": 1,
+  "fixture_id": "EDO_24_microtonal_regular",
+  "description": "Quarter-tone chromatic segment on 24-EDO grid (bin_cents=50).",
+  "tags": [
+    "microtonal",
+    "edo24"
+  ],
+  "analysis": {
+    "homogeneity_method": "dominance",
+    "bin_cents": 50,
+    "hybrid_alpha": 0.6,
+    "dominance_threshold": 0.35,
+    "even_high": 0.8,
+    "even_low": 0.3,
+    "chain_threshold": 0.6,
+    "intervallic_headline_mode": "pairwise_intervallic_concentration",
+    "edo": 24
+  },
+  "qualitative": {
+    "regular_adjacent_spacing": true
+  },
+  "notes": [
+    [
+      "C",
+      0.0,
+      4
+    ],
+    [
+      "C",
+      0.5,
+      4
+    ],
+    [
+      "D",
+      0.0,
+      4
+    ],
+    [
+      "D",
+      0.5,
+      4
+    ]
+  ]
+}

corpus/fixtures/interval_homogeneity_regression/EDO_bin_change_sensitivity.json

@@ -0,0 +1,48 @@
+{
+  "schema_version": 1,
+  "fixture_id": "EDO_bin_change_sensitivity",
+  "description": "Same four semitones analysed at bin_cents=100 vs 50 (modelling choice).",
+  "tags": [
+    "edo",
+    "binning"
+  ],
+  "analysis": {
+    "homogeneity_method": "dominance",
+    "bin_cents": 100,
+    "hybrid_alpha": 0.6,
+    "dominance_threshold": 0.35,
+    "even_high": 0.8,
+    "even_low": 0.3,
+    "chain_threshold": 0.6,
+    "intervallic_headline_mode": "pairwise_intervallic_concentration"
+  },
+  "qualitative": {
+    "binning_is_modelling_choice": true
+  },
+  "notes": [
+    [
+      "C",
+      0.0,
+      4
+    ],
+    [
+      "C",
+      1.0,
+      4
+    ],
+    [
+      "D",
+      0.0,
+      4
+    ],
+    [
+      "D",
+      1.0,
+      4
+    ]
+  ],
+  "bin_variants": [
+    100,
+    50
+  ]
+}

corpus/fixtures/interval_homogeneity_regression/augmented_triad_symmetric.json

@@ -0,0 +1,39 @@
+{
+  "schema_version": 1,
+  "fixture_id": "augmented_triad_symmetric",
+  "description": "Augmented triad C4–E4–G#4: equal major-third division in 12-TET.",
+  "tags": [
+    "triad",
+    "symmetric"
+  ],
+  "analysis": {
+    "homogeneity_method": "dominance",
+    "bin_cents": 100,
+    "hybrid_alpha": 0.6,
+    "dominance_threshold": 0.35,
+    "even_high": 0.8,
+    "even_low": 0.3,
+    "chain_threshold": 0.6,
+    "intervallic_headline_mode": "pairwise_intervallic_concentration"
+  },
+  "qualitative": {
+    "stronger_than": "major_triad_close"
+  },
+  "notes": [
+    [
+      "C",
+      0.0,
+      4
+    ],
+    [
+      "E",
+      0.0,
+      4
+    ],
+    [
+      "G",
+      1.0,
+      4
+    ]
+  ]
+}

corpus/fixtures/interval_homogeneity_regression/chromatic_cluster_four.json

@@ -0,0 +1,44 @@
+{
+  "schema_version": 1,
+  "fixture_id": "chromatic_cluster_four",
+  "description": "Four consecutive semitones C4–D#4: regular adjacent spacing, diverse pairwise set.",
+  "tags": [
+    "cluster",
+    "adjacent_vs_pairwise"
+  ],
+  "analysis": {
+    "homogeneity_method": "dominance",
+    "bin_cents": 100,
+    "hybrid_alpha": 0.6,
+    "dominance_threshold": 0.35,
+    "even_high": 0.8,
+    "even_low": 0.3,
+    "chain_threshold": 0.6,
+    "intervallic_headline_mode": "pairwise_intervallic_concentration"
+  },
+  "qualitative": {
+    "chain_gt_pair": true
+  },
+  "notes": [
+    [
+      "C",
+      0.0,
+      4
+    ],
+    [
+      "C",
+      1.0,
+      4
+    ],
+    [
+      "D",
+      0.0,
+      4
+    ],
+    [
+      "D",
+      1.0,
+      4
+    ]
+  ]
+}

corpus/fixtures/interval_homogeneity_regression/diminished_seventh_symmetric.json

@@ -0,0 +1,44 @@
+{
+  "schema_version": 1,
+  "fixture_id": "diminished_seventh_symmetric",
+  "description": "Diminished seventh C4–A4: symmetric minor-third tiling.",
+  "tags": [
+    "seventh",
+    "symmetric"
+  ],
+  "analysis": {
+    "homogeneity_method": "dominance",
+    "bin_cents": 100,
+    "hybrid_alpha": 0.6,
+    "dominance_threshold": 0.35,
+    "even_high": 0.8,
+    "even_low": 0.3,
+    "chain_threshold": 0.6,
+    "intervallic_headline_mode": "pairwise_intervallic_concentration"
+  },
+  "qualitative": {
+    "stronger_than": "dominant_seventh_irregular"
+  },
+  "notes": [
+    [
+      "C",
+      0.0,
+      4
+    ],
+    [
+      "E",
+      -1.0,
+      4
+    ],
+    [
+      "G",
+      -1.0,
+      4
+    ],
+    [
+      "A",
+      0.0,
+      4
+    ]
+  ]
+}

corpus/fixtures/interval_homogeneity_regression/dominant_seventh_irregular.json

@@ -0,0 +1,44 @@
+{
+  "schema_version": 1,
+  "fixture_id": "dominant_seventh_irregular",
+  "description": "Dominant seventh C4–Bb4: same cardinality as dim7, less regular pairwise profile.",
+  "tags": [
+    "seventh",
+    "irregular"
+  ],
+  "analysis": {
+    "homogeneity_method": "dominance",
+    "bin_cents": 100,
+    "hybrid_alpha": 0.6,
+    "dominance_threshold": 0.35,
+    "even_high": 0.8,
+    "even_low": 0.3,
+    "chain_threshold": 0.6,
+    "intervallic_headline_mode": "pairwise_intervallic_concentration"
+  },
+  "qualitative": {
+    "same_cardinality_as": "diminished_seventh_symmetric"
+  },
+  "notes": [
+    [
+      "C",
+      0.0,
+      4
+    ],
+    [
+      "E",
+      0.0,
+      4
+    ],
+    [
+      "G",
+      0.0,
+      4
+    ],
+    [
+      "B",
+      -1.0,
+      4
+    ]
+  ]
+}

corpus/fixtures/interval_homogeneity_regression/inversion_same_interval_multiset.json

@@ -0,0 +1,40 @@
+{
+  "schema_version": 1,
+  "fixture_id": "inversion_same_interval_multiset",
+  "description": "Inversion of major_triad_close around E4: E4 G#4 C#4.",
+  "tags": [
+    "metamorphic",
+    "inversion"
+  ],
+  "analysis": {
+    "homogeneity_method": "dominance",
+    "bin_cents": 100,
+    "hybrid_alpha": 0.6,
+    "dominance_threshold": 0.35,
+    "even_high": 0.8,
+    "even_low": 0.3,
+    "chain_threshold": 0.6,
+    "intervallic_headline_mode": "pairwise_intervallic_concentration"
+  },
+  "qualitative": {
+    "interval_multiset_preserved": true
+  },
+  "notes": [
+    [
+      "E",
+      0.0,
+      4
+    ],
+    [
+      "G",
+      1.0,
+      4
+    ],
+    [
+      "C",
+      1.0,
+      4
+    ]
+  ],
+  "reference_fixture": "major_triad_close"
+}

corpus/fixtures/interval_homogeneity_regression/major_triad_close.json

@@ -0,0 +1,39 @@
+{
+  "schema_version": 1,
+  "fixture_id": "major_triad_close",
+  "description": "Closed major triad C4–E4–G4: three distinct pairwise interval types.",
+  "tags": [
+    "triad",
+    "irregular_pairwise"
+  ],
+  "analysis": {
+    "homogeneity_method": "dominance",
+    "bin_cents": 100,
+    "hybrid_alpha": 0.6,
+    "dominance_threshold": 0.35,
+    "even_high": 0.8,
+    "even_low": 0.3,
+    "chain_threshold": 0.6,
+    "intervallic_headline_mode": "pairwise_intervallic_concentration"
+  },
+  "qualitative": {
+    "compare_with": "augmented_triad_symmetric"
+  },
+  "notes": [
+    [
+      "C",
+      0.0,
+      4
+    ],
+    [
+      "E",
+      0.0,
+      4
+    ],
+    [
+      "G",
+      0.0,
+      4
+    ]
+  ]
+}

corpus/fixtures/interval_homogeneity_regression/manifest.json

@@ -0,0 +1,39 @@
+{
+  "schema_version": 1,
+  "suite": "interval_homogeneity_regression",
+  "phase": 1,
+  "fixture_count": 20,
+  "fixtures": [
+    "unison_dyad",
+    "single_interval_dyad_perfect_fifth",
+    "minor_second_dyad",
+    "chromatic_cluster_four",
+    "whole_tone_segment_four",
+    "stacked_fourths",
+    "stacked_fifths",
+    "major_triad_close",
+    "augmented_triad_symmetric",
+    "diminished_seventh_symmetric",
+    "dominant_seventh_irregular",
+    "same_cardinality_different_distribution_A",
+    "same_cardinality_different_distribution_B",
+    "octave_duplication_case",
+    "transposed_same_structure",
+    "inversion_same_interval_multiset",
+    "EDO_24_microtonal_regular",
+    "EDO_bin_change_sensitivity",
+    "repeated_pitch_density_not_homogeneity",
+    "passage_changing_interval_field"
+  ],
+  "default_analysis": {
+    "homogeneity_method": "dominance",
+    "bin_cents": 100,
+    "hybrid_alpha": 0.6,
+    "dominance_threshold": 0.35,
+    "even_high": 0.8,
+    "even_low": 0.3,
+    "chain_threshold": 0.6,
+    "intervallic_headline_mode": "pairwise_intervallic_concentration"
+  },
+  "notes": "Qualitative/metamorphic regression only. No locked scalar golden values in phase 1."
+}