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      "changed": "gearbox_first_gear_smooth_annular_envelope",
      "source": "gearbox-internals",
      "neighbor": "gearbox_reverse_idler_spindle_smooth_comparison",
      "before_mm3": 0,
      "after_mm3": 0
    },
    {
      "changed": "gearbox_third_gear_smooth_annular_envelope",
      "source": "transmission-formed-castings-reference",
      "neighbor": "gearbox_main_case_reference",
      "before_mm3": 0.0,
      "after_mm3": 0.0
    },
    {
      "changed": "gearbox_second_gear_smooth_annular_envelope",
      "source": "transmission-formed-castings-reference",
      "neighbor": "gearbox_main_case_reference",
      "before_mm3": 0.0,
      "after_mm3": 0.0
    },
    {
      "changed": "gearbox_first_gear_smooth_annular_envelope",
      "source": "transmission-formed-castings-reference",
      "neighbor": "gearbox_main_case_reference",
      "before_mm3": 0.0,
      "after_mm3": 0.0
    }
  ],
  "source_sha256": {
    "gearbox-internals-reference.json": "6d6914a85d0d58fe12abda86dd46cefb77bb61823519a35097de8ee90245d3c3",
    "gearbox-internals-reference.step": "86326c47f8784bd115323b2068c114ed4544157ed6c6f975b1c04982f76bb82c",
    "gearbox-catalog-gears-reference.json": "23220faa7eb8b8d5eb1e0b79ada8743d47f9f5d203d7884bfe949f7dc1b38b37",
    "gearbox-catalog-gears-reference.step": "6023a05a894769959510adaea6b7a2258c823ecc3eadd142c1c0f1092fa12e8e"
  },
  "limits": "Count/profile witnesses and static native/mesh comparisons only. Containment in earlier smooth envelopes does not establish working mesh, fitted part identity, tolerances, loaded clearance, ratios, strength or a verified replacement path. Every profile dimension and helix convention remains estimated; all neighboring poses stay fixed.",
  "metadata_revision": "Superseded the inherited no-tooth-surfaces sentence in catalog_tooth_count_comparisons.limits after native checks; mesh and STEP geometry unchanged."
}