Fix: CIccCLUT::Iterate() & CIccMBB::Describe()

[xsscx]

Pull Request Checklist

(#704)

• Have you followed the guidelines in Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you built your Pull Request locally with the Build Instructions?
• Have you added or updated relevant tests?
• Have you added or updated relevant docs?

[xsscx]

PR Author Summary

2026-03-27 04:34:56 UTC

This PR addresses #704 & #705

Unpatched Outputs

BEGIN_LUT CLUT 3 4
 CMYK_1=3 CMYK_2=3 CMYK_3=3   Lab_1 Lab_2 Lab_3 Lab_4
BEGIN_LUT A_Curve_Lab_1 1 1
IN OUT

Patched Outputs

[2026-03-27 04:34:56 UTC] ~/issue-704/iccDEV/Testing (issue-704)$ git log --oneline --graph -1
* b606697 (HEAD -> issue-704, origin/issue-704) Fix: CIccCLUT::Validate()
[2026-03-27 04:35:25 UTC] ~/issue-704/iccDEV/Testing (issue-704)$ iccDumpProfile -v 100 cfl-049-btoa-lut16-test.icc ALL 2>/dev/null | grep -A3 "BEGIN_LUT CLUT"
BEGIN_LUT CLUT 3 4
 CMYK_1=3 CMYK_2=3 CMYK_3=3   Lab_1 Lab_2 Lab_3 Lab_4
   0.000   0.000   0.000     0.000 -125.609 -123.219   2.814
   0.000   0.000  50.000     3.752 -116.039 -113.648   6.567
--
BEGIN_LUT CLUT 4 3
 Lab_1=3 Lab_2=3 Lab_3=3 Lab_4=3   CMYK_1 CMYK_2 CMYK_3
   0.000 -128.000 -128.000   0.000    18.837  18.894  18.950
   0.000 -128.000 -128.000  50.195    19.007  19.063  19.120

[xsscx]

GHSA-5r4q-77w5-3q3h