{
  "date": "2026-09-28",
  "protocol": "Three serial paired release-test executions per comparison, alternating historical/current order. No concurrent builds or qualification. Times are subprocess wall clock including harness startup and process-wait polling.",
  "artifact_directory": "hypercurve-api-review-2026-09-12 (workspace sibling)",
  "workloads": [
    {
      "name": "joined_continuous_fillet_replay",
      "test": "curve::curve_fillet::tests::joined_path_selects_and_replays_a_continuous_fillet_family",
      "receipt": "joined-fillet-comparison-20260928-v710-terminal.json",
      "datasets": {
        "historical": {
          "source_snapshot": "finite-domain-ownership-20260927-v527",
          "source_manifest_sha256": "f2c28004f2fdf6e6dfa741ad3d995dbbf28d29ca0055ebbbbbde084617db3008",
          "binary_filename": "finite-domain-ownership-20260927-v527-hypercurve-tests",
          "binary_sha256": "b8083c1ba7e48b0bfd502aadc363b41bc5fd563cc45fed0907fb697746f2a796",
          "samples_seconds": [
            3.017772409133613,
            3.0677436320111156,
            3.017884701024741
          ],
          "median_seconds": 3.017884701024741
        },
        "current": {
          "source_snapshot": "native-path-shims-20260928-v707",
          "source_manifest_sha256": "a0c6088b36f8bd909ddfa407da0d71b8f52266423a2477c2106932dff6c5f441",
          "binary_filename": "native-path-shims-20260928-v707-hypercurve-tests",
          "binary_sha256": "5bc63c1f9bb8c562fa648c2b039549d564aa1e1c54e5fa57f5399b71e8f86584",
          "samples_seconds": [
            0.31431858194991946,
            0.3142467369325459,
            0.3142815539613366
          ],
          "median_seconds": 0.3142815539613366
        }
      },
      "all_six_cases_passed": true
    },
    {
      "name": "degree_six_offset_overlap",
      "test": "bezier_offset::structural_overlap_trace_regression::monotone_reparameterization_preserves_structural_pair_crossings_strict",
      "receipt": "interpolation-content-comparison-20260928-v699-terminal.json",
      "datasets": {
        "baseline": {
          "source_snapshot": "projection-overlap-20260928-v695",
          "source_manifest_sha256": "8dddc4dd9e1fc1356e11d275a232f3bc295f4b8716932f5c74d69ea81b9385ab",
          "binary_filename": "projection-overlap-20260928-v695-hypercurve-tests",
          "binary_sha256": "75c4c6f2698922f292f6bd1114d54df4f2c21828e0b7885e1be676bde0d0cb2c",
          "samples_seconds": [
            47.524575830902904,
            47.87797054601833,
            47.92854729807004
          ],
          "median_seconds": 47.87797054601833
        },
        "candidate": {
          "source_snapshot": "interpolation-content-20260928-v697",
          "source_manifest_sha256": "931d9391c8cc1cc30d78b2dcd758eacf4400e3840545fc67d2d3fc0712246435",
          "binary_filename": "interpolation-content-20260928-v697-hypercurve-tests",
          "binary_sha256": "14e239716adfa64f002d29c22f950c5f07bfeb3d48eed4965b762b39d92041f5",
          "samples_seconds": [
            45.82323097786866,
            45.83372189803049,
            46.02391707804054
          ],
          "median_seconds": 45.83372189803049
        }
      },
      "all_six_cases_passed": true
    }
  ],
  "limits": [
    "These are full regression workloads, not per-operation microbenchmarks or a uniform performance claim.",
    "Joined-fillet constructor helpers, successful operation sequence and geometric assertions match the historical baseline; only failure diagnostics differ. All 68 public fillet requests include constraint rejection, both traversal directions, both policies and strict replay.",
    "The joined-fillet current binary precedes the subsequently verified orientation-only API rename. Intervening implementation contributions are not isolated.",
    "The offset comparison changes only common rational ordinate content normalization in Hypersolve. Its test retains two isolated crossings, one overlap and public overlap-clipping replay.",
    "No new allocation, retained-memory or binary-size measurements."
  ]
}