Optimize Mesh now does what it says.

It used to report "Optimized 1 objects" and leave the mesh untouched. The merge

step asked Blender's mesh operation for a result it does not return, which threw

an error on the very first step; the error was swallowed, so nothing else in the

optimisation ran either — no degenerate-face cleanup, no loose-geometry removal,

no normal recalculation — and the mesh was never written back. The button

reported success regardless, because the operator never looked at whether the

work had actually succeeded.

Both are fixed. On a model with every vertex duplicated on top of itself, the

count now goes from 1014 to 505 with 509 vertices merged; before this release it

stayed at 1014. The button also tells you what it did — how many vertices were

merged, or that nothing needed merging, or which objects could not be processed

and why — instead of claiming success either way.

Checked on Blender 4.2.9 LTS, 5.1 and 5.2: enabling and disabling the add-on,

every operator run on a real scene, and the repair measured before and after.

Nothing else in the add-on is changed.