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Corner-bracket parametric fidelity: diagonal band, base scoops, band fillets #6

Description

@MasoudMiM

Follow-up from #5 (fixed in v0.17.3). The bracket now reconstructs and the
corrected shape is mesh-accurate, but the parametric feature body still
approximates the part's freeform geometry:

  • Diagonal transition band. Fits no analytic primitive; the feature tree
    approximates it, leaving the parametric body ~1–2% under the mesh volume.
    Only the deviation-correction pass reproduces it exactly.
  • Base scoops. Same class of freeform geometry, same residual.
  • Band fillets. The four r1.5 fillets on the diagonal band are detected
    but skipped by the executor — the feature body has no sharp edge at their
    positions to dress.

Possible directions:

  1. Loft/sweep or multi-section primitives for the band, so the feature tree
    carries it natively.
  2. Accept deviation-correction patches as the carrier for this geometry
    class (current behaviour) and document the boundary.

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