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  "front_shell_check_point_ids": [
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  "conditional_rear_shell_xy_circle": {
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    "radius_mm": 58.81604987555691,
    "rms_native_mm": 1.013573791859975,
    "scope": "Partial rear silver shell, Z-parallel circular constraint; no measured shaft or diameter."
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  "conditional_seam_medians_z_mm": {
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    "front": 223.22188191486396
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  "former_shaft_xy_mm": [
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  "selected_shaft_xy_mm": [
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  "selected_translation_mm": [
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  "held_shaft_direction": [
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  ],
  "held_band_length_mm": 25,
  "former_belt_lane_z_mm": 215.5,
  "selected_alternator_pulley_lane_z_mm": 295.5,
  "crank_pump_belt_lane_held_z_mm": 215.5,
  "unresolved_axial_drive_plane_difference_mm": 80.0,
  "moved_source_names": [
    "alternator_pivot_spacer_catalog_reference_provisional",
    "alternator_pivot_bolt_catalog_length_provisional",
    "alternator_pivot_retainer_catalog_reference_provisional",
    "alternator_rear_cover_photo_reference_provisional",
    "alternator_rear_connector_housing_catalog_reference_provisional",
    "alternator_stator_band_photo_reference_provisional",
    "alternator_rotor_claw_pole_architecture_provisional",
    "alternator_rotor_field_winding_architecture_provisional",
    "alternator_rotor_slip_rings_architecture_provisional",
    "alternator_visible_case_tie_owner_photo_provisional",
    "alternator_photo_reference_provisional",
    "alternator_cooling_fan_catalog_reference_provisional",
    "alternator_pulley_catalog_diameter_provisional"
  ],
  "limits": "Photo-estimated rigid translation conditioned on unmeasured152mm stud spacing, interpreted engine axes and shared camera assumptions. Silver-shell circular section/parallel-Z shaft are construction constraints, not fitted shaft measurements. Partial visible arcs do not establish full axis orientation or metric accuracy. Original dimensions, stator catalog comparison, internal architecture, pivot-to-shaft comparison, fan and pulley sizes stay; retained25mm band disagrees with the shorter reconstructed seam interval. No owner dimension, body/engine registration, new bracket outline, belt length/tension, working clearance, load support, removal procedure or path is verified. The old lower bracket, adjusting link and belt stay separately selectable comparisons, hidden in the assembled whole-car view; their engine endpoints and the crank/pump/fan remain unchanged. The drive and support boundaries are deliberately unresolved rather than joined by invented geometry. Historical detailed core remains in its original pose."
}